SIST ISO 15740:2011
Photography - Electronic still picture imaging - Picture transfer protocol (PTP) for digital still photography devices
Photography - Electronic still picture imaging - Picture transfer protocol (PTP) for digital still photography devices
This International Standard provides a common communication protocol for exchanging images with and between digital still photography devices (DSPDs). This includes communication between DSPDs and host computers, printers, other digital still devices, telecommunications kiosks and image storage and display devices. This protocol is transport- and platform-independent.
Photographie - Imagerie des prises de vue électroniques - Protocole de transfert d'images (PTP) pour les appareils photographiques électroniques numériques
Fotografija - Digitalno upodabljanje mirujočih slik - Protokol za prenašanje slik pri fotografskih napravah za mirujoče slike (PTP)
Ta mednarodni standard podaja splošni komunikacijski protokol za izmenjavo slik fotografskimi napravami za mirujoče slike (DSPD) in med njimi. Ta vključuje komunikacijo med DSPD in gostiteljskimi računalniki, tiskalniki, drugimi digitalnimi napravami za mirujoče slike, telekomunikacijskimi kioski in napravami za shranjevanje in prikaz slik. Ta protokol ni odvisen od prevoza in platforme.
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INTERNATIONAL ISO
STANDARD 15740
Second edition
2008-05-01
Photography — Electronic still picture
imaging — Picture transfer protocol (PTP)
for digital still photography devices
Photographie — Imagerie des prises de vue électroniques — Protocole
de transfert d'images (PTP) pour les appareils photographiques
électroniques numériques
Reference number
ISO 15740:2008(E)
©
ISO 2008
---------------------- Page: 1 ----------------------
ISO 15740:2008(E)
PDF disclaimer
This PDF file may contain embedded typefaces. In accordance with Adobe's licensing policy, this file may be printed or viewed but
shall not be edited unless the typefaces which are embedded are licensed to and installed on the computer performing the editing. In
downloading this file, parties accept therein the responsibility of not infringing Adobe's licensing policy. The ISO Central Secretariat
accepts no liability in this area.
Adobe is a trademark of Adobe Systems Incorporated.
Details of the software products used to create this PDF file can be found in the General Info relative to the file; the PDF-creation
parameters were optimized for printing. Every care has been taken to ensure that the file is suitable for use by ISO member bodies. In
the unlikely event that a problem relating to it is found, please inform the Central Secretariat at the address given below.
COPYRIGHT PROTECTED DOCUMENT
© ISO 2008
All rights reserved. Unless otherwise specified, no part of this publication may be reproduced or utilized in any form or by any means,
electronic or mechanical, including photocopying and microfilm, without permission in writing from either ISO at the address below or
ISO's member body in the country of the requester.
ISO copyright office
Case postale 56 • CH-1211 Geneva 20
Tel. + 41 22 749 01 11
Fax + 41 22 749 09 47
E-mail copyright@iso.org
Web www.iso.org
Published in Switzerland
ii © ISO 2008 – All rights reserved
---------------------- Page: 2 ----------------------
ISO 15740:2008(E)
Contents Page
Foreword. v
Introduction . vi
1 Scope . 1
2 Normative references . 1
3 Terms and definitions. 1
4 Digital still photography device model. 5
4.1 Overview . 5
4.2 Baseline requirements . 6
5 Data format specification. 7
5.1 General format . 7
5.2 Data types. 7
5.3 Simple types. 9
5.4 Arrays. 11
5.5 Datasets . 12
6 Image and data object formats. 21
6.1 Object usage . 21
6.2 Thumbnail formats. 23
6.3 ObjectFormatCodes. 24
6.4 Object format version identification . 24
6.5 Data object association. 24
7 Transport requirements . 27
7.1 Disconnection events. 27
7.2 Reliable, error-free channel . 27
7.3 Asynchronous event support. 27
7.4 Device discovery and enumeration . 27
7.5 Specific transports . 27
8 Persistent storage. 28
8.1 StorageID . 28
8.2 Data object referencing. 28
8.3 Receiver object placement . 29
9 Communication protocol . 30
9.1 Device roles. 30
9.2 Sessions . 30
9.3 Transactions. 30
9.4 Operation flow. 33
9.5 Vendor extensions. 33
10 Operations . 34
10.1 Operation overview. 34
10.2 Operation parameters. 34
10.3 OperationCode format. 35
10.4 OperationCode summary. 35
10.5 Operation descriptions. 35
11 Responses. 60
11.1 ResponseCode format. 60
11.2 ResponseCode summary. 61
11.3 Response descriptions . 62
© ISO 2008 – All rights reserved iii
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ISO 15740:2008(E)
12 Events. 66
12.1 Event usage . 66
12.2 Event types . 67
12.3 Event dataset. 67
12.4 EventCode format . 68
12.5 EventCode summary . 68
12.6 Event descriptions . 68
13 Device properties . 72
13.1 Device property usage. 72
13.2 Values of a device property . 72
13.3 Device property management requirements. 73
13.4 Device property identification. 73
13.5 Device property descriptions. 76
14 Streaming (PTP v1.1 only). 93
14.1 Streaming overview . 93
14.2 Stream transfer. 93
14.3 Multiplexing . 94
14.4 Discovering and configuring stream capabilities. 94
14.5 Data transfer mechanism . 94
14.6 Packet layout . 95
14.7 Frame layout. 96
14.8 Enumerating supported streams. 96
14.9 Retrieving stream information. 96
15 Conformance section . 96
Annex A (informative) Optional device features. 99
Annex B (normative) Object referencing and format codes . 101
Annex C (informative) Operation flow example scenarios. 103
Annex D (informative) Filesystem implementation examples. 107
Annex E (informative) Reference to OSI model . 110
Annex F (informative) SendObject implementation example. 113
Bibliography . 116
iv © ISO 2008 – All rights reserved
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ISO 15740:2008(E)
Foreword
ISO (the International Organization for Standardization) is a worldwide federation of national standards bodies
(ISO member bodies). The work of preparing International Standards is normally carried out through ISO
technical committees. Each member body interested in a subject for which a technical committee has been
established has the right to be represented on that committee. International organizations, governmental and
non-governmental, in liaison with ISO, also take part in the work. ISO collaborates closely with the
International Electrotechnical Commission (IEC) on all matters of electrotechnical standardization.
International Standards are drafted in accordance with the rules given in the ISO/IEC Directives, Part 2.
The main task of technical committees is to prepare International Standards. Draft International Standards
adopted by the technical committees are circulated to the member bodies for voting. Publication as an
International Standard requires approval by at least 75 % of the member bodies casting a vote.
Attention is drawn to the possibility that some of the elements of this document may be the subject of patent
rights. ISO shall not be held responsible for identifying any or all such patent rights.
ISO 15740 was prepared by Technical Committee ISO/TC 42, Photography.
This second edition cancels and replaces the first edition (ISO 15740:2005) which has been technically
revised.
© ISO 2008 – All rights reserved v
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ISO 15740:2008(E)
Introduction
This second edition of ISO 15740 (hereinafter designated PTP v1.1) provides optional support for new
increased performance and compatibility. All new constructs are fully backward compatible with the first
edition (hereinafter designated PTP v1.0) and are optional. See 5.5.2 for standard version.
For the purposes of this International Standard, digital still photography devices (DSPDs) are defined as
devices with persistent storage which capture a digital two-dimensional image at a discrete point in time. Most
DSPDs include interfaces that can be used to connect to a host computer or other imaging device, such as a
printer. A number of high speed interface transports has been developed, including USB, TCP/IP and
IEEE 1394 (FireWire). This International Standard is designed to provide requirements for communicating with
DSPDs. This includes communications with any type of device, including host computers, direct printers and
other DSPDs over a suitable transport. The requirements include standard image referencing behaviour,
operations, responses, events, device properties, datasets and data formats to ensure interoperability. This
International Standard also provides optional operations and formats, as well as extension mechanisms.
This International Standard specifies the following:
⎯ behaviour requirements for DSPDs; this includes the baseline features a device needs to support in order
to provide interoperability over conforming transports;
⎯ functional requirements needed by a transport to facilitate the creation of a transport-dependent
implementation specification that conforms to this International Standard;
⎯ a high-level protocol for communicating with and between DSPDs consisting of operation, data and
response phases;
⎯ sets of suggested data codes and their usages including
⎯ OperationCodes,
⎯ ResponseCodes,
⎯ ObjectFormatCodes,
⎯ DevicePropCodes,
⎯ EventCodes,
⎯ required datasets and their usages,
⎯ a means of describing data object associations and filesystems and
⎯ mechanisms for implementing extensibility.
This International Standard does not attempt to define any of the following:
⎯ any sort of device discovery, enumeration or transport aggregation methods; implementation of this
functionality is left to the transports and the platforms upon which support for this International Standard is
implemented;
⎯ an application programming interface; this is left to the platforms upon which support for this International
Standard is implemented.
vi © ISO 2008 – All rights reserved
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ISO 15740:2008(E)
This International Standard has been designed to appropriately support popular image formats used in digital
[15]
still cameras, including the Exif and TIFF/EP formats defined in ISO 12234-1 and ISO 12234-2, as well as
the Design Rule for Camera Filesystem (DCF) and the Digital Print Order Format (DPOF).
The technical content of this International Standard is closely related to PIMA 15740:2000. The main
difference is that PIMA 15740:2000 includes an informative annex describing a USB implementation of
ISO 15740. This information is not included in this International Standard, which instead references the USB
still device class document developed by the Device Working Group of the USB Implementers Forum.
PTP v1.1 provides optional support for new increased performance and compatibility. All new constructs are
fully backward compatible with PTP v1.0 and are optional.
⎯ Performance Enhancements:
⎯ Support for retrieval of ObjectHandles in enumerated chunks, via specification of three new optional
operations and a new response code. This may reduce long response times for some initiators that
possess large numbers of objects.
⎯ Support for optional arbitrary resizing prior to image transmission via specification of a new operation
GetResizedImageObject. In PTP v1.0, image sizes might be requested in full-resolution or thumbnail
size only.
⎯ Support for arrays of datasets. This can be used to reduce the number of required transactions
necessary for device characterization from being a function of the number of objects on the device to
one.
⎯ An optional fast file characterization operation called GetFilesystemManifest that exploits dataset
arrays to request, in a single transaction, only the minimum data required to characterize a typical
filesystem. Many initiators, particularly in printing scenarios, are interested in fast filesystem
characterization for access to a specifically named file in a particular place. This capability can
significantly improve end-user workflow latency. This single operation replaces the typical series of
many GetObjectInfo requests with a binary filesystem manifest. This manifest is defined as a simple
array of a subset of the standard ObjectInfo dataset called the ObjectFilesystemInfo dataset. This
operation replaces the need for many GetObjectInfo calls, while also avoiding the need for
responders to perform many internal file-opens on the fly, or to cache ObjectInfo image data that is
often held persistenly only “inside” internal image files (e.g. TIFF tags inside EXIF JPEGs), to quickly
communicate only the fast filesystem information.
⎯ Compatibility Enhancements:
⎯ An optional mechanism to support multiple vendor extension sets. This is specified via the new
VendorExtensionMap dataset, and two new optional operations that may be invoked outside of a
session (GetVendorExtensionMaps and GetVendorDeviceInfo).
⎯ The optional fast file characterization method GetFilesystemManifest natively supports extremely
large objects, by requiring 8-bytes for object size (UINT64), as opposed to the standard 4-bytes.
⎯ A new standard ObjectFormatCode to support the Digital Negative file format (DNG).
⎯ Feature Enhancement:
⎯ An optional mechanism for handling streaming content. This is specified via the new StreamInfo
dataset, as well as the supporting GetStreamInfo and GetStream operations, as well as some
optional new supporting DeviceProperties. This is described in a new Clause 14.
© ISO 2008 – All rights reserved vii
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INTERNATIONAL STANDARD ISO 15740:2008(E)
Photography — Electronic still picture imaging — Picture
transfer protocol (PTP) for digital still photography devices
1 Scope
This International Standard provides a common communication protocol for exchanging images with and
between digital still photography devices (DSPDs). This includes communication between DSPDs and host
computers, printers, other digital still devices, telecommunications kiosks and image storage and display
devices.
This protocol is transport- and platform-independent.
2 Normative references
The following referenced documents are indispensable for the application of this document. For dated
references, only the edition cited applies. For undated references, the latest edition of the referenced
document (including any amendments) applies.
ISO 8601, Data elements and interchange formats — Information interchange — Representation of dates and
times
ISO 12234-2, Electronic still-picture imaging — Removable memory — Part 2: TIFF/EP image data format
ISO/IEC 10646, Information technology — Universal Multiple-Octet Coded Character Set (UCS)
ISO/IEC 10918-1:1994, Information technology — Digital compression and coding of continuous-tone still
images: Requirements and guidelines
IEC 61966-2-1, Multimedia systems and equipment — Colour measurement and management — Part 2-1:
Colour management — Default RGB colour space — sRGB
3 Terms and definitions
For the purposes of this document, the following terms and definitions apply.
3.1
album
end-user-created object used to logically group data objects according to some user-defined criteria
NOTE An album might or might not be a physical folder in a filesystem. In this International Standard, an album is a
type of association.
3.2
association
logical construct used to expose a relationship between discrete objects
NOTE Associations are used to indicate that separate data objects are related. Associations are represented like
folders, and can be nested using a standard branched hierarchical tree structure.
EXAMPLE A time sequence, or user-defined groupings by content or capture session.
© ISO 2008 – All rights reserved 1
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ISO 15740:2008(E)
3.3
connection
transport-provided mechanism for establishing paths for transferring data between devices
3.4
datacode
16-bit unsigned integer whose Most Significant Nibble (4 bits) is used to indicate the category of code and
whether the code value is standard or vendor-extended
3.5
data object
image or other type of data that typically exists in persistent storage of a DSPD or other device
3.6
dataset
transport-independent collection of one or more individual data items with known interpretations
NOTE Datasets are not necessarily opaque nor atomic to transport implementations.
3.7
Design Rule for Camera Filesystem
DCF
standard convention for camera filesystems which specifies the file format, foldering and naming conventions
in order to promote file interoperability between conforming digital photography devices
3.8
device discovery
act of determining the set of all devices present on a particular transport or platform that are physically or
logically accessible
3.9
digital still photography device
DSPD
device with persistent storage which captures a two-dimensional digital still image
3.10
Digital Print Order Format
DPOF
standardized ASCII file stored on removable media along with the image files that indicates how many copies
of which images should be printed
NOTE DPOF also allows index prints, cropping, and text overlays to be specified.
3.11
enumeration
act of creating an ordered increasing numerical list that contains one representative element for each member
of a set
3.12
Exif/JPEG
compressed file format for digital cameras in which the images are compressed using the baseline JPEG
standard described in ISO 12234-2
NOTE In Exif, metadata and thumbnail images are stored using TIFF tags within an application segment at the
beginning of the JPEG file.
3.13
folder
optional sub-structure in a hierarchical storage area that can contain data objects
2 © ISO 2008 – All rights reserved
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ISO 15740:2008(E)
3.14
FlashPix
image file format, defined in FlashPix Format Specification, using a structured storage file containing metadata
and a tiled, hierarchical image representation
NOTE The tiles in a FlashPix image are normally baseline JPEG images, and individual image tiles of a particular
resolution can be easily accessed for rapid display and editing.
3.15
IEEE 1394
high-speed serial bus standardized by the IEEE (Institute of Electrical and Electronics Engineers) currently
having clock rates of 100, 200 and 400 Mbits/s
NOTE IEEE 1394 is often referred to as FireWire.
3.16
image aspect ratio
ratio of the image width to the image height
3.17
image capture device
device for converting a scene or a fixed image, such as a print, film or transparency, to digital image data
3.18
image output device
device that can render a digital image to hardcopy or softcopy media
3.19
in-band event
event transmitted on the same logical connection as operations and responses
NOTE Events are only asynchronous to the degree of data precision for which the transport implementation allows
event interleaving.
3.20
initiator
device that initiates a conversation by opening a session, and issues all formal operations to the responder
NOTE The initiator is analogous to the client in the client/server paradigm.
3.21
International Imaging Industry Association
I3A
organization that serves to represent the common interests among manufacturers of imaging technology
products
NOTE See http://www.i3a.org.
3.22
Infrared Data Association
IrDA
infrared wireless communication system that currently supports wireless communication at data rates between
9 600 bps and 4 Mbps.
3.23
Joint Photographic Experts Group
JPEG
specific image compression method defined in ISO/IEC 10918-1
© ISO 2008 – All rights reserved 3
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ISO 15740:2008(E)
3.24
LogicalStorageID
least significant sixteen bits of a StorageID
NOTE This value uniquely identifies one logical storage area within the physical store indicated in the
PhysicalStorageID.
3.25
Most Significant Nibble
MSN
most significant four bits of the most significant byte
3.26
object aggregation
act of taking one or more location-specific lists of objects that exist on a particular device and grouping them
together in one set
3.27
ObjectHandle
device-unique 32-bit unsigned integer assigned by a device to each data object in local persistent storage
which is provided to external devices
NOTE External recipients of an ObjectHandle must use it to reference that piece of data in subsequent transactions.
ObjectHandles are guaranteed to be persistent over at least a session.
3.28
out-of-band event
event transmitted on a different logical connection to that for operations and responses
NOTE Out-of-band events are asynchronous from operation transactions.
3.29
personal computer
PC
any personal computing device, which may employ various hardware architectures and operating systems
3.30
PhysicalStorageID
most significant sixteen bits of a StorageID
NOTE This value uniquely identifies one physical storage area on a device, although there may be more than one
logical store per physical store.
3.31
Portable Network Graphics
PNG
extensible file format for lossless, portable, compressed storage of raster images
NOTE PNG supports indexed colour, greyscale, truecolour and an optional alpha channel.
3.32
protocol
defined mechanisms for exchanging data between devices
3.33
pull model
use paradigm for DSPDs where the object receiver initiates the operation requests to transfer data objects
from the sender
4 © ISO 2008 – All rights reserved
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ISO 15740:2008(E)
3.34
push model
use paradigm for DSPDs where the object sender initiates the operation requests to transfer data objects to
the receiver
3.3
...
SLOVENSKI STANDARD
SIST ISO 15740:2011
01-julij-2011
)RWRJUDILMD'LJLWDOQRXSRGDEOMDQMHPLUXMRþLKVOLN3URWRNRO]DSUHQDãDQMHVOLNSUL
IRWRJUDIVNLKQDSUDYDK]DPLUXMRþHVOLNH 373
Photography - Electronic still picture imaging - Picture transfer protocol (PTP) for digital
still photography devices
Photographie - Imagerie des prises de vue électroniques - Protocole de transfert
d'images (PTP) pour les appareils photographiques électroniques numériques
Ta slovenski standard je istoveten z: ISO 15740:2008
ICS:
37.040.99 Drugi standardi v zvezi s Other standards related to
fotografijo photography
SIST ISO 15740:2011 en
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.
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SIST ISO 15740:2011
---------------------- Page: 2 ----------------------
SIST ISO 15740:2011
INTERNATIONAL ISO
STANDARD 15740
Second edition
2008-05-01
Photography — Electronic still picture
imaging — Picture transfer protocol (PTP)
for digital still photography devices
Photographie — Imagerie des prises de vue électroniques — Protocole
de transfert d'images (PTP) pour les appareils photographiques
électroniques numériques
Reference number
ISO 15740:2008(E)
©
ISO 2008
---------------------- Page: 3 ----------------------
SIST ISO 15740:2011
ISO 15740:2008(E)
PDF disclaimer
This PDF file may contain embedded typefaces. In accordance with Adobe's licensing policy, this file may be printed or viewed but
shall not be edited unless the typefaces which are embedded are licensed to and installed on the computer performing the editing. In
downloading this file, parties accept therein the responsibility of not infringing Adobe's licensing policy. The ISO Central Secretariat
accepts no liability in this area.
Adobe is a trademark of Adobe Systems Incorporated.
Details of the software products used to create this PDF file can be found in the General Info relative to the file; the PDF-creation
parameters were optimized for printing. Every care has been taken to ensure that the file is suitable for use by ISO member bodies. In
the unlikely event that a problem relating to it is found, please inform the Central Secretariat at the address given below.
COPYRIGHT PROTECTED DOCUMENT
© ISO 2008
All rights reserved. Unless otherwise specified, no part of this publication may be reproduced or utilized in any form or by any means,
electronic or mechanical, including photocopying and microfilm, without permission in writing from either ISO at the address below or
ISO's member body in the country of the requester.
ISO copyright office
Case postale 56 • CH-1211 Geneva 20
Tel. + 41 22 749 01 11
Fax + 41 22 749 09 47
E-mail copyright@iso.org
Web www.iso.org
Published in Switzerland
ii © ISO 2008 – All rights reserved
---------------------- Page: 4 ----------------------
SIST ISO 15740:2011
ISO 15740:2008(E)
Contents Page
Foreword. v
Introduction . vi
1 Scope . 1
2 Normative references . 1
3 Terms and definitions. 1
4 Digital still photography device model. 5
4.1 Overview . 5
4.2 Baseline requirements . 6
5 Data format specification. 7
5.1 General format . 7
5.2 Data types. 7
5.3 Simple types. 9
5.4 Arrays. 11
5.5 Datasets . 12
6 Image and data object formats. 21
6.1 Object usage . 21
6.2 Thumbnail formats. 23
6.3 ObjectFormatCodes. 24
6.4 Object format version identification . 24
6.5 Data object association. 24
7 Transport requirements . 27
7.1 Disconnection events. 27
7.2 Reliable, error-free channel . 27
7.3 Asynchronous event support. 27
7.4 Device discovery and enumeration . 27
7.5 Specific transports . 27
8 Persistent storage. 28
8.1 StorageID . 28
8.2 Data object referencing. 28
8.3 Receiver object placement . 29
9 Communication protocol . 30
9.1 Device roles. 30
9.2 Sessions . 30
9.3 Transactions. 30
9.4 Operation flow. 33
9.5 Vendor extensions. 33
10 Operations . 34
10.1 Operation overview. 34
10.2 Operation parameters. 34
10.3 OperationCode format. 35
10.4 OperationCode summary. 35
10.5 Operation descriptions. 35
11 Responses. 60
11.1 ResponseCode format. 60
11.2 ResponseCode summary. 61
11.3 Response descriptions . 62
© ISO 2008 – All rights reserved iii
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SIST ISO 15740:2011
ISO 15740:2008(E)
12 Events. 66
12.1 Event usage . 66
12.2 Event types . 67
12.3 Event dataset. 67
12.4 EventCode format . 68
12.5 EventCode summary . 68
12.6 Event descriptions . 68
13 Device properties . 72
13.1 Device property usage. 72
13.2 Values of a device property . 72
13.3 Device property management requirements. 73
13.4 Device property identification. 73
13.5 Device property descriptions. 76
14 Streaming (PTP v1.1 only). 93
14.1 Streaming overview . 93
14.2 Stream transfer. 93
14.3 Multiplexing . 94
14.4 Discovering and configuring stream capabilities. 94
14.5 Data transfer mechanism . 94
14.6 Packet layout . 95
14.7 Frame layout. 96
14.8 Enumerating supported streams. 96
14.9 Retrieving stream information. 96
15 Conformance section . 96
Annex A (informative) Optional device features. 99
Annex B (normative) Object referencing and format codes . 101
Annex C (informative) Operation flow example scenarios. 103
Annex D (informative) Filesystem implementation examples. 107
Annex E (informative) Reference to OSI model . 110
Annex F (informative) SendObject implementation example. 113
Bibliography . 116
iv © ISO 2008 – All rights reserved
---------------------- Page: 6 ----------------------
SIST ISO 15740:2011
ISO 15740:2008(E)
Foreword
ISO (the International Organization for Standardization) is a worldwide federation of national standards bodies
(ISO member bodies). The work of preparing International Standards is normally carried out through ISO
technical committees. Each member body interested in a subject for which a technical committee has been
established has the right to be represented on that committee. International organizations, governmental and
non-governmental, in liaison with ISO, also take part in the work. ISO collaborates closely with the
International Electrotechnical Commission (IEC) on all matters of electrotechnical standardization.
International Standards are drafted in accordance with the rules given in the ISO/IEC Directives, Part 2.
The main task of technical committees is to prepare International Standards. Draft International Standards
adopted by the technical committees are circulated to the member bodies for voting. Publication as an
International Standard requires approval by at least 75 % of the member bodies casting a vote.
Attention is drawn to the possibility that some of the elements of this document may be the subject of patent
rights. ISO shall not be held responsible for identifying any or all such patent rights.
ISO 15740 was prepared by Technical Committee ISO/TC 42, Photography.
This second edition cancels and replaces the first edition (ISO 15740:2005) which has been technically
revised.
© ISO 2008 – All rights reserved v
---------------------- Page: 7 ----------------------
SIST ISO 15740:2011
ISO 15740:2008(E)
Introduction
This second edition of ISO 15740 (hereinafter designated PTP v1.1) provides optional support for new
increased performance and compatibility. All new constructs are fully backward compatible with the first
edition (hereinafter designated PTP v1.0) and are optional. See 5.5.2 for standard version.
For the purposes of this International Standard, digital still photography devices (DSPDs) are defined as
devices with persistent storage which capture a digital two-dimensional image at a discrete point in time. Most
DSPDs include interfaces that can be used to connect to a host computer or other imaging device, such as a
printer. A number of high speed interface transports has been developed, including USB, TCP/IP and
IEEE 1394 (FireWire). This International Standard is designed to provide requirements for communicating with
DSPDs. This includes communications with any type of device, including host computers, direct printers and
other DSPDs over a suitable transport. The requirements include standard image referencing behaviour,
operations, responses, events, device properties, datasets and data formats to ensure interoperability. This
International Standard also provides optional operations and formats, as well as extension mechanisms.
This International Standard specifies the following:
⎯ behaviour requirements for DSPDs; this includes the baseline features a device needs to support in order
to provide interoperability over conforming transports;
⎯ functional requirements needed by a transport to facilitate the creation of a transport-dependent
implementation specification that conforms to this International Standard;
⎯ a high-level protocol for communicating with and between DSPDs consisting of operation, data and
response phases;
⎯ sets of suggested data codes and their usages including
⎯ OperationCodes,
⎯ ResponseCodes,
⎯ ObjectFormatCodes,
⎯ DevicePropCodes,
⎯ EventCodes,
⎯ required datasets and their usages,
⎯ a means of describing data object associations and filesystems and
⎯ mechanisms for implementing extensibility.
This International Standard does not attempt to define any of the following:
⎯ any sort of device discovery, enumeration or transport aggregation methods; implementation of this
functionality is left to the transports and the platforms upon which support for this International Standard is
implemented;
⎯ an application programming interface; this is left to the platforms upon which support for this International
Standard is implemented.
vi © ISO 2008 – All rights reserved
---------------------- Page: 8 ----------------------
SIST ISO 15740:2011
ISO 15740:2008(E)
This International Standard has been designed to appropriately support popular image formats used in digital
[15]
still cameras, including the Exif and TIFF/EP formats defined in ISO 12234-1 and ISO 12234-2, as well as
the Design Rule for Camera Filesystem (DCF) and the Digital Print Order Format (DPOF).
The technical content of this International Standard is closely related to PIMA 15740:2000. The main
difference is that PIMA 15740:2000 includes an informative annex describing a USB implementation of
ISO 15740. This information is not included in this International Standard, which instead references the USB
still device class document developed by the Device Working Group of the USB Implementers Forum.
PTP v1.1 provides optional support for new increased performance and compatibility. All new constructs are
fully backward compatible with PTP v1.0 and are optional.
⎯ Performance Enhancements:
⎯ Support for retrieval of ObjectHandles in enumerated chunks, via specification of three new optional
operations and a new response code. This may reduce long response times for some initiators that
possess large numbers of objects.
⎯ Support for optional arbitrary resizing prior to image transmission via specification of a new operation
GetResizedImageObject. In PTP v1.0, image sizes might be requested in full-resolution or thumbnail
size only.
⎯ Support for arrays of datasets. This can be used to reduce the number of required transactions
necessary for device characterization from being a function of the number of objects on the device to
one.
⎯ An optional fast file characterization operation called GetFilesystemManifest that exploits dataset
arrays to request, in a single transaction, only the minimum data required to characterize a typical
filesystem. Many initiators, particularly in printing scenarios, are interested in fast filesystem
characterization for access to a specifically named file in a particular place. This capability can
significantly improve end-user workflow latency. This single operation replaces the typical series of
many GetObjectInfo requests with a binary filesystem manifest. This manifest is defined as a simple
array of a subset of the standard ObjectInfo dataset called the ObjectFilesystemInfo dataset. This
operation replaces the need for many GetObjectInfo calls, while also avoiding the need for
responders to perform many internal file-opens on the fly, or to cache ObjectInfo image data that is
often held persistenly only “inside” internal image files (e.g. TIFF tags inside EXIF JPEGs), to quickly
communicate only the fast filesystem information.
⎯ Compatibility Enhancements:
⎯ An optional mechanism to support multiple vendor extension sets. This is specified via the new
VendorExtensionMap dataset, and two new optional operations that may be invoked outside of a
session (GetVendorExtensionMaps and GetVendorDeviceInfo).
⎯ The optional fast file characterization method GetFilesystemManifest natively supports extremely
large objects, by requiring 8-bytes for object size (UINT64), as opposed to the standard 4-bytes.
⎯ A new standard ObjectFormatCode to support the Digital Negative file format (DNG).
⎯ Feature Enhancement:
⎯ An optional mechanism for handling streaming content. This is specified via the new StreamInfo
dataset, as well as the supporting GetStreamInfo and GetStream operations, as well as some
optional new supporting DeviceProperties. This is described in a new Clause 14.
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INTERNATIONAL STANDARD ISO 15740:2008(E)
Photography — Electronic still picture imaging — Picture
transfer protocol (PTP) for digital still photography devices
1 Scope
This International Standard provides a common communication protocol for exchanging images with and
between digital still photography devices (DSPDs). This includes communication between DSPDs and host
computers, printers, other digital still devices, telecommunications kiosks and image storage and display
devices.
This protocol is transport- and platform-independent.
2 Normative references
The following referenced documents are indispensable for the application of this document. For dated
references, only the edition cited applies. For undated references, the latest edition of the referenced
document (including any amendments) applies.
ISO 8601, Data elements and interchange formats — Information interchange — Representation of dates and
times
ISO 12234-2, Electronic still-picture imaging — Removable memory — Part 2: TIFF/EP image data format
ISO/IEC 10646, Information technology — Universal Multiple-Octet Coded Character Set (UCS)
ISO/IEC 10918-1:1994, Information technology — Digital compression and coding of continuous-tone still
images: Requirements and guidelines
IEC 61966-2-1, Multimedia systems and equipment — Colour measurement and management — Part 2-1:
Colour management — Default RGB colour space — sRGB
3 Terms and definitions
For the purposes of this document, the following terms and definitions apply.
3.1
album
end-user-created object used to logically group data objects according to some user-defined criteria
NOTE An album might or might not be a physical folder in a filesystem. In this International Standard, an album is a
type of association.
3.2
association
logical construct used to expose a relationship between discrete objects
NOTE Associations are used to indicate that separate data objects are related. Associations are represented like
folders, and can be nested using a standard branched hierarchical tree structure.
EXAMPLE A time sequence, or user-defined groupings by content or capture session.
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3.3
connection
transport-provided mechanism for establishing paths for transferring data between devices
3.4
datacode
16-bit unsigned integer whose Most Significant Nibble (4 bits) is used to indicate the category of code and
whether the code value is standard or vendor-extended
3.5
data object
image or other type of data that typically exists in persistent storage of a DSPD or other device
3.6
dataset
transport-independent collection of one or more individual data items with known interpretations
NOTE Datasets are not necessarily opaque nor atomic to transport implementations.
3.7
Design Rule for Camera Filesystem
DCF
standard convention for camera filesystems which specifies the file format, foldering and naming conventions
in order to promote file interoperability between conforming digital photography devices
3.8
device discovery
act of determining the set of all devices present on a particular transport or platform that are physically or
logically accessible
3.9
digital still photography device
DSPD
device with persistent storage which captures a two-dimensional digital still image
3.10
Digital Print Order Format
DPOF
standardized ASCII file stored on removable media along with the image files that indicates how many copies
of which images should be printed
NOTE DPOF also allows index prints, cropping, and text overlays to be specified.
3.11
enumeration
act of creating an ordered increasing numerical list that contains one representative element for each member
of a set
3.12
Exif/JPEG
compressed file format for digital cameras in which the images are compressed using the baseline JPEG
standard described in ISO 12234-2
NOTE In Exif, metadata and thumbnail images are stored using TIFF tags within an application segment at the
beginning of the JPEG file.
3.13
folder
optional sub-structure in a hierarchical storage area that can contain data objects
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3.14
FlashPix
image file format, defined in FlashPix Format Specification, using a structured storage file containing metadata
and a tiled, hierarchical image representation
NOTE The tiles in a FlashPix image are normally baseline JPEG images, and individual image tiles of a particular
resolution can be easily accessed for rapid display and editing.
3.15
IEEE 1394
high-speed serial bus standardized by the IEEE (Institute of Electrical and Electronics Engineers) currently
having clock rates of 100, 200 and 400 Mbits/s
NOTE IEEE 1394 is often referred to as FireWire.
3.16
image aspect ratio
ratio of the image width to the image height
3.17
image capture device
device for converting a scene or a fixed image, such as a print, film or transparency, to digital image data
3.18
image output device
device that can render a digital image to hardcopy or softcopy media
3.19
in-band event
event transmitted on the same logical connection as operations and responses
NOTE Events are only asynchronous to the degree of data precision for which the transport implementation allows
event interleaving.
3.20
initiator
device that initiates a conversation by opening a session, and issues all formal operations to the responder
NOTE The initiator is analogous to the client in the client/server paradigm.
3.21
International Imaging Industry Association
I3A
organization that serves to represent the common interests among manufacturers of imaging technology
products
NOTE See http://www.i3a.org.
3.22
Infrared Data Association
IrDA
infrared wireless communication system that currently supports wireless communication at data rates between
9 600 bps and 4 Mbps.
3.23
Joint Photographic Experts Group
JPEG
specific image compression method defined in ISO/IEC 10918-1
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3.24
LogicalStorageID
least significant sixteen bits of a StorageID
NOTE This value uniquely identifies one logical storage area within the physical store indicated in the
PhysicalStorageID.
3.25
Most Significant Nibble
MSN
most significant four bits of the most significant byte
3.26
object aggregation
act of taking one or more location-specific lists of objects that exist on a particular device and grouping them
together in one set
3.27
ObjectHandle
device-unique 32-bit unsigned integer assigned by a device to each data object in local persistent storage
which is provided to external devices
NOTE External recipients of an ObjectHandle must use it to reference that piece of data in subsequent transactions.
ObjectHandles are guaranteed to be persistent over at least a session.
3.28
out-of-b
...
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