ISO/IEC 23008-12:2025/FDAmd 1

Information technology — High efficiency coding and media delivery in heterogeneous environments — Part 12: Image File Format — Amendment 1: Support for tone map derivation and other technologies

Technologies de l'information — Codage à haute efficacité et livraison des medias dans des environnements hétérogènes — Partie 12: Format de fichier d'image — Amendement 1: Support pour la dérivation de la carte des tonalités et autres technologies

General Information

• Status: Not Published
• ICS: 35.040.40 - Coding of audio, video, multimedia and hypermedia information
• Technical Committee: ISO/IEC JTC 1/SC 29 - Coding of audio, picture, multimedia and hypermedia information
• Drafting Committee: ISO/IEC JTC 1/SC 29/WG 3 - MPEG Systems
• Current Stage: 5020 - FDIS ballot initiated: 2 months. Proof sent to secretariat
• Start Date: 23-Jul-2025
• Completion Date: 23-Jul-2025

Relations

• Amends: ISO/IEC 23008-12:2025 - Information technology — High efficiency coding and media delivery in heterogeneous environments — Part 12: Image File Format
• Effective Date: 24-Feb-2024

Standards Content (Sample)

FINAL DRAFT
Amendment
ISO/IEC
23008-12:2025/
FDAM 1
ISO/IEC JTC 1/SC 29
Information technology — High
Secretariat: JISC
efficiency coding and media
Voting begins on:
delivery in heterogeneous
2025-07-23
environments —
Voting terminates on:
2025-09-17
Part 12:
Image File Format
AMENDMENT 1: Support for tone map
derivation and other technologies
RECIPIENTS OF THIS DRAFT ARE INVITED TO SUBMIT,
WITH THEIR COMMENTS, NOTIFICATION OF ANY
RELEVANT PATENT RIGHTS OF WHICH THEY ARE AWARE
AND TO PROVIDE SUPPOR TING DOCUMENTATION.
IN ADDITION TO THEIR EVALUATION AS
BEING ACCEPTABLE FOR INDUSTRIAL, TECHNO­
LOGICAL, COMMERCIAL AND USER PURPOSES, DRAFT
INTERNATIONAL STANDARDS MAY ON OCCASION HAVE
TO BE CONSIDERED IN THE LIGHT OF THEIR POTENTIAL
TO BECOME STAN DARDS TO WHICH REFERENCE MAY BE
MADE IN NATIONAL REGULATIONS.
Reference number
ISO/IEC 23008­12:2025/FDAM 1:2025(en) © ISO/IEC 2025

FINAL DRAFT
ISO/IEC 23008-12:2025/FDAM 1:2025(en)
Amendment
ISO/IEC
23008-12:2025/
FDAM 1
ISO/IEC JTC 1/SC 29
Information technology — High
Secretariat: JISC
efficiency coding and media
Voting begins on:
delivery in heterogeneous
environments —
Voting terminates on:
Part 12:
Image File Format
AMENDMENT 1: Support for tone map
derivation and other technologies
RECIPIENTS OF THIS DRAFT ARE INVITED TO SUBMIT,
WITH THEIR COMMENTS, NOTIFICATION OF ANY
RELEVANT PATENT RIGHTS OF WHICH THEY ARE AWARE
AND TO PROVIDE SUPPOR TING DOCUMENTATION.
© ISO/IEC 2025
IN ADDITION TO THEIR EVALUATION AS
All rights reserved. Unless otherwise specified, or required in the context of its implementation, no part of this publication may
BEING ACCEPTABLE FOR INDUSTRIAL, TECHNO­
LOGICAL, COMMERCIAL AND USER PURPOSES, DRAFT
be reproduced or utilized otherwise in any form or by any means, electronic or mechanical, including photocopying, or posting on
INTERNATIONAL STANDARDS MAY ON OCCASION HAVE
the internet or an intranet, without prior written permission. Permission can be requested from either ISO at the address below
TO BE CONSIDERED IN THE LIGHT OF THEIR POTENTIAL
or ISO’s member body in the country of the requester.
TO BECOME STAN DARDS TO WHICH REFERENCE MAY BE
MADE IN NATIONAL REGULATIONS.
ISO copyright office
CP 401 • Ch. de Blandonnet 8
CH-1214 Vernier, Geneva
Phone: [phone]
Email: [e-mail]
Website: www.iso.org
Published in Switzerland Reference number
ISO/IEC 23008­12:2025/FDAM 1:2025(en) © ISO/IEC 2025

© ISO/IEC 2025 – All rights reserved
ii
ISO/IEC 23008-12:2025/FDAM 1:2025(en)
Foreword
ISO (the International Organization for Standardization) and IEC (the International Electrotechnical
Commission) form the specialized system for worldwide standardization. National bodies that are
members of ISO or IEC participate in the development of International Standards through technical
committees established by the respective organization to deal with particular fields of technical activity.
ISO and IEC technical committees collaborate in fields of mutual interest. Other international organizations,
governmental and non-governmental, in liaison with ISO and IEC, also take part in the work.
The procedures used to develop this document and those intended for its further maintenance are described
in the ISO/IEC Directives, Part 1. In particular, the different approval criteria needed for the different types
of document should be noted. This document was drafted in accordance with the editorial rules of the ISO/
IEC Directives, Part 2 (see www.iso.org/directives or www.iec.ch/members_experts/refdocs).
ISO and IEC draw attention to the possibility that the implementation of this document may involve the
use of (a) patent(s). ISO and IEC take no position concerning the evidence, validity or applicability of any
claimed patent rights in respect thereof. As of the date of publication of this document, ISO and IEC had not
received notice of (a) patent(s) which may be required to implement this document. However, implementers
are cautioned that this may not represent the latest information, which may be obtained from the patent
database available at www.iso.org/patents and https://patents.iec.ch. ISO and IEC shall not be held
responsible for identifying any or all such patent rights.
Any trade name used in this document is information given for the convenience of users and does not
constitute an endorsement.
For an explanation of the voluntary nature of standards, the meaning of ISO specific terms and expressions
related to conformity assessment, as well as information about ISO's adherence to the World Trade
Organization (WTO) principles in the Technical Barriers to Trade (TBT) see www.iso.org/iso/foreword.html.
In the IEC, see www.iec.ch/understanding-standards.
This document was prepared by Joint Technical Committee ISO/IEC JTC 1, Information technology,
Subcommittee SC 29, Coding of audio, picture, multimedia and hypermedia information.
A list of all parts in the ISO/IEC 23008 series can be found on the ISO and IEC websites.
Any feedback or questions on this document should be directed to the user’s national standards
body. A complete listing of these bodies can be found at www.iso.org/members.html and
www.iec.ch/national-committees.

© ISO/IEC 2025 – All rights reserved
iii
ISO/IEC 23008-12:2025/FDAM 1:2025(en)
Information technology — High efficiency coding and media
delivery in heterogeneous environments —
Part 12:
Image File Format
AMENDMENT 1: Support for tone map derivation and other
technologies
Clause 2
Add the following normative references to Clause 2:
ISO/CIE 11664-3, Colorimetry — Part 3: CIE tristimulus values
ISO/CIE 11664-4, Colorimetry — Part 4: CIE 1976 L*a*b* colour space
ISO 21496-1, Digital photography — Gain map metadata for image conversion — Part 1: Dynamic range
conversion
Subclause 3.1
Add the following terms:
3.1.53
merge region item
region item (3.1.45) associated with an image item (3.1.19) that represents an approximate, merge or
summary of one or more region items associated with one or more other image items
3.1.54
tone-map derived image item
derived image item (3.1.9) of type 'tmap' where the operation (3.1.34) is to apply the output image (3.1.35)
of a gain map image item (3.1.56) to the output image of a base image item (3.1.55) according to ISO 21496-1
Note 1 to entry: ISO 21496-1 gain maps can for example be used to create a fully defined backwards compatible
transformation from SDR to HDR output and vice-versa.
3.1.55
base image item
image item (3.1.19) that is the first input to a tone-mapderived image item (3.1.54)
3.1.56
gain map image item
image item (3.1.19) that is the second input to a tone-map derived image item (3.1.54)
3.1.57
backward playback
playback of timed content in reverse chronological order

© ISO/IEC 2025 – All rights reserved
ISO/IEC 23008-12:2025/FDAM 1:2025(en)
Subclause 3.2
Add the following abbreviated terms:
SDR standard dynamic range
Subclause 6.4
Subclause 6.4.4
nd
Replace the 2 sentence with:
The thumbnail image and master image(s) are linked using a reference type 'thmb' from the thumbnail
image to the master image.
Subclause 6.4.5
rd
Replace the 3 sentence with:
The auxiliary image and master image(s) are linked using an item reference of 'auxl' from the auxiliary
image to the master image.
Subclause 6.4.9
Add the following new subclauses after subclause 6.4.9:
6.4.10  Overview images
An overview image is described by a grid derived image item or a tiled pre-derived coded image item
or a tiled image item whose reconstructed image is formed from generating a lower resolution, ‘binned’
version of the reconstructed image of a base image item. The base image item is also tiled. The tiling may
be implemented using a feature of a specific codec, or by using a grid derived image item, or by using a tiled
image item. When a grid derived image item is used, the input items to the grid define the tiles. Derived
image items shall not be used as inputs to the image grid, due to the need for in place byte range accessing of
content. Individual tiles shall be written contiguously in memory, thereby allowing access with a single read
or write action.
A pre-derived coded image item representing an overview image or an image item representing the base
image that are tiled using a feature of a specific codec shall be stored in such a way that each extent identifies
that data range corresponding to a tile and shall be associated with a ConstrainedExtentsGridProperty
indicating the constraint on the extents and describing the tiling grid.
In cases where the binned resolution results in a fractional, or incomplete tile at the end of a row (column),
the last tile in a row (column) of tiles shall be padded with the value zero at the end of the row (column)
to complete the last tile in the row (column). If necessary, the clean aperture transformative property
('clap') may be applied to crop padded rows and/or columns. The number of tiles in a row (column) of tiles
is determined by dividing the width (height) of the overview image by the tile size in X (tile size in Y) and
rounding up.
The image format of the overview images is the same as the base image. i.e. number of bands, bit depth,
colour format, etc.
© ISO/IEC 2025 – All rights reserved
ISO/IEC 23008-12:2025/FDAM 1:2025(en)
Overview images can be stacked together with the base image as a series of progressively binned images in
an image pyramid entity group as defined in 6.8.11.
NOTE 1 In this version of the document, the exact derivation process (approaches such as the sum, average, median,
minimum, or maximum value of a binned region) used to produce an overview from the base image is left to the
implementer.
NOTE 2 When removing (or modifying) an item that is marked as the base image of an overview image, the content
of associated image overview items might need to be removed (or rewritten).

Clause 6.5
Clauses 6.5.18.1, 6.5.19.1, 6.5.20.1, 6.5.27.1, 6.5.35.1
Replace the word "item_ID" with the phrase "identifier value"
Clauses 6.5.18.1, 6.5.19.1, 6.5.20.1, 6.5.27.1, 6.5.35.1
Append the following text as a new paragraph:
If this property is associated with an entity group, the FileTypeBox or the ExtendedTypeBox associated with
the FileTypeBox shall indicate that the requirements of the 'unif' brand apply in the file.

Subclause 6.5.39.1
Append the following sentence and NOTE to the first paragraph and renumber existing NOTEs accordingly.
The CameraExtrinsicMatrixProperty describes the camera extrinsics of the item output image.
NOTE 1 As specified in clause 6.5.1, all descriptive properties that come after transform properties are ignored.
This means that CameraExtrinsicMatrixProperty needs to precede all transform properties even though it
describes the output image.
Subclause 6.5.40.1
Append the following sentence and NOTE to the first paragraph. Renumber existing NOTEs accordingly.
The CameraIntrinsicMatrixProperty describes the camera intrinsics of the item output image.
NOTE 1 As specified in clause 6.5.1, all descriptive properties that come after transform properties are ignored.
This means that CameraIntrinsicMatrixProperty needs to precede all transform properties even though it
describes the output image.
Replace the following:
The values of the above intrinsic matrix can be calculated as follows:
f = focal_length_x × image_width /denominator
x
f = focal_length_y × image_height /denominator
y
c = principal_point_x × image_width /denominator
x
© ISO/IEC 2025 – All rights reserved
ISO/IEC 23008-12:2025/FDAM 1:2025(en)
c = principal_point_y × image_height /denominator
y
s = skew_factor /skewDenominator
where image_width and image_height come from the ImageSpatialExtentsProperty associated with the
image item.
with
The values of the above intrinsic matrix can be calculated as follows:
f = focal_length_x × imageWidth / denominator
x
f = focal_length_y × imageHeight / denominator
y
c = principal_point_x × imageWidth / denominator
x
c = principal_point_y × imageHeight / denominator
y
s = skew_factor / skewDenominator
where imageWidth and imageHeight are the output dimensions of the image item after applying all
transformative properties, if any. If no transformative properties are associated with the item this translates
respectively to the dimensions image_width and image_height in the ImageSpatialExtentsProperty.

Subclause 6.5.40
Add the following new subclauses after subclause 6.5.40. Renumber tables as needed:

6.5.41  Constrained extents grid
6.5.41.1  Definition
'cexg'
Box type:
Property type: Descriptive item property
ItemPropertyContainerBox
Container:
Mandatory (per item): No
Quantity (per item): At most one

The ConstrainedExtentsGridProperty descriptive item property indicates that each extent of the associated
image item in the itemLocationBox is constrained to enclose data units of the item that are extractable as a
contiguous byte range and are independently decodable and renderable as image tiles.
The configuration data needed to decode each extent independently may be present in the ExtentDecoderC
onfigurationRecord within the ConstrainedExtentsGridProperty. If the configuration data is not present
in the ConstrainedExtentsGridProperty, all data units or properties required to configure the decoder and

© ISO/IEC 2025 – All rights reserved
ISO/IEC 23008-12:2025/FDAM 1:2025(en)
decode an image tile shall be declared in the decoder configuration and initialization properties associated
with the image item.
The reconstructed image of the associated image item is formed from one or more image tiles in a given grid
order within a larger canvas.
The image tiles corresponding to the extents are inserted in row-major order, top-row first, left to right, in
the order of the extents for the associated image item within the ItemLocationBox. The value of extent_count
within the ItemLocationBox shall be equal to (1+rows_minus_one)*(1+columns_minus_one). All image tiles
shall have exactly the same width and height, image_tile_width and image_tile_height. The reconstructed
image is formed by tiling the image tiles into a grid with a column width equal to image_tile_width and
a row height equal to image_tile_height, without gap or overlap. The grid of image tiles shall completely
“cover” the reconstructed image of the associated image item, where image_tile_width*columns is greater
than or equal to image_width and image_tile_height*rows is greater than or equal to im
...

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Information technology — High efficiency coding and media
delivery in heterogeneous environments — —
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Image File Format — Amendment
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AMENDMENT 1: Support for tone map derivation and other
technologies
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iii
ISO/IEC 23008-12:2025/AMDFDAmd 1:2025(E(en)
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Foreword . v
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2 Normative references . 1
3.1 Terms and definitions . 1
3.1.53 merge region item . 1
3.1.54 tone-map derived image item . 1
3.1.55 base image item . 1
3.1.56 gain map image item . 1
3.1.57 backward playback . 1
3.2 Abbreviated terms . 1
6.4 Roles of images . 2
6.4.10 Overview images . 2
6.5 Image properties . 2
6.5.41 Constrained extents grid . 4
6.5.42 Disparity adjustment information . 5
6.5.43 Stereo aggressors . 6
6.5.44 Reference viewing environment . 8
6.5.45 Nominal diffuse white . 9
6.6 Derived images and derived image items . 9
6.6.2.4 Tone-map derivation . 10
6.6.2.5 Colour format enhancement derivation . 12
6.8 Entity and sample groups . 14
6.8.11 'stem' entity grouping . 14
6.8.12 Image pyramid entity group . 15
6.8.13 Region partition group . 17
7.2.3 Coding Constraints box . 19
10.2 Image and image collection brands . 20
10.2.6 'tmap' brand . 20
11.3 Regions and region annotations for an image item . 20
11.3.4 Merge region item . 20
A Storage of externally specified metadata . 21
A.6 ITU-T T.35 metadata . 21
B.3.2 Derivation from ISO/IEC 14496-12 and ISO/IEC 14496-15 . 21
E.3.2 Derivation from ISO/IEC 14496-12 and ISO/IEC 14496-15 . 21
J Examples of image collections . 21
J.7 Tone-map derivation . 22
L.3.2 Derivation from ISO/IEC 14496-12 and ISO/IEC 14496-15 . 24
M.3.2 Derivation from ISO/IEC 14496-12 and ISO/IEC 14496-15 . 24
Bibliography . 25
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Foreword
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ISO (the International Organization for Standardization) and IEC (the International Electrotechnical
Commission) form the specialized system for worldwide standardization. National bodies that are members Formatted: Font: Bold
of ISO or IEC participate in the development of International Standards through technical committees
established by the respective organization to deal with particular fields of technical activity. ISO and IEC
technical committees collaborate in fields of mutual interest. Other international organizations, governmental
and non-governmental, in liaison with ISO and IEC, also take part in the work.
The procedures used to develop this document and those intended for its further maintenance are described
in the ISO/IEC Directives, Part 1. In particular, the different approval criteria needed for the different types of
document should be noted. This document was drafted in accordance with the editorial rules of the ISO/IEC
Directives, Part 2 (see www.iso.org/directiveswww.iso.org/directives or
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ISO and IEC draw attention to the possibility that the implementation of this document may involve the use of
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notice of (a) patent(s) which may be required to implement this document. However, implementers are
cautioned that this may not represent the latest information, which may be obtained from the patent database
available at www.iso.org/patents and https://patents.iec.ch.www.iso.org/patents and https://patents.iec.ch.
ISO and IEC shall not be held responsible for identifying any or all such patent rights.
Any trade name used in this document is information given for the convenience of users and does not
constitute an endorsement.
For an explanation of the voluntary nature of standards, the meaning of ISO specific terms and expressions
related to conformity assessment, as well as information about ISO's adherence to the World Trade
Organization (WTO) principles in the Technical Barriers to Trade (TBT) see
www.iso.org/iso/foreword.html.www.iso.org/iso/foreword.html. In the IEC, see www.iec.ch/understanding-
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standards.
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This document was prepared by Joint Technical Committee ISO/IEC JTC 1, Information technology,
Subcommittee SC 29, Coding of audio, picture, multimedia and hypermedia information.
A list of all parts in the ISO/IEC 23008 series can be found on the ISO and IEC websites.
Any feedback or questions on this document should be directed to the user’s national standards body. A
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vi © ISO/IEC 2025 – All rights reserved
vi
ISO/IEC 23008-12:2025/AMDFDAmd 1:2025(E(en)
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Information technology — High efficiency coding and media delivery
in heterogeneous environments — —
Part 12:
Image File Format — Amendment
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AMENDMENT 1: Support for tone map derivation and other
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technologies Formatted: Font: Italic
Formatted: English (United Kingdom)

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of the same style
Clause 2:
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Add the following normative references to the end of clause Clause 2: (Switzerland)
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ISO/CIE 11664-3, Colorimetry — Part 3: CIE tristimulus values
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ISO/CIE 11664-4, Colorimetry — Part 4: CIE 1976 L*a*b* colour space
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(Switzerland)
ISO/DIS 21496-1, Digital Photographyphotography — Gain map metadata for image conversion — Part 1:
Formatted
...
Dynamic Range Conversionrange conversion
Formatted
...
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Subclause 3.1:
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Add the following terms. Update numbering after sorting.:
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3.1.53
of the same style
merge region item
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region item (3.1.45) asso
...