ISO/TS 20791-2:2021

Photography — Photographic reflection prints — Part 2: Evaluation of colour variation in printing

This document describes the procedures for evaluation of colour variation in the printing of photographic reflection colour prints. The following procedures are described to evaluate colour variation in printing within a consecutive print job, between several print jobs, or between multiple photographic images printed in different areas of a large sheet: a) test targets for small and large photographic prints; b) printing procedures and conditions; c) sampling in correspondence to the production scale; d) measurement of colour; e) calculation and analysis of colour variation and f) reporting. The procedures presented in this document are applicable for prints with a size of available picture area ranging from 35 cm2 (e.g. 5 cm × 7 cm) to 5 400 cm2 (e.g. 60 cm × 90 cm). This document is applicable to any of the photographic printing technologies, including inkjet, thermal dye transfer, electrophotography and silver halide (chromogenic) technologies.

Photographie — Tirages photographiques par réflexion — Partie 2: Évaluation de la variation de couleur dans l'impression

General Information

• Status: Published
• Publication Date: 19-Oct-2021
• ICS: 37.040.20 - Photographic paper, films and plates. Cartridges
• Technical Committee: ISO/TC 42 - Photography
• Drafting Committee: ISO/TC 42/WG 3 - Image measurement, viewing and sensitometry
• Current Stage: 9020 - International Standard under periodical review
• Start Date: 15-Jan-2024
• Completion Date: 15-Jan-2024

Standards Content (Sample)

TECHNICAL ISO/TS
SPECIFICATION 20791-2
First edition
2021-10
Photography — Photographic
reflection prints —
Part 2:
Evaluation of colour variation in
printing
Photographie — Tirages photographiques par réflexion —
Partie 2: Évaluation de la variation de couleur dans l'impression
Reference number
ISO/TS 20791-2:2021(E)
© ISO 2021

---------------------- Page: 1 ----------------------
ISO/TS 20791-2:2021(E)
COPYRIGHT PROTECTED DOCUMENT
© ISO 2021
All rights reserved. Unless otherwise specified, or required in the context of its implementation, no part of this publication may
be reproduced or utilized otherwise in any form or by any means, electronic or mechanical, including photocopying, or posting on
the internet or an intranet, without prior written permission. Permission can be requested from either ISO at the address below
or ISO’s member body in the country of the requester.
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
ii
  © ISO 2021 – All rights reserved

---------------------- Page: 2 ----------------------
ISO/TS 20791-2:2021(E)
Contents Page
Foreword .iv
Introduction .v
1 Scope . 1
2 Normative references . 1
3 Terms and definitions . 1
3.1 Terms. 2
3.2 Abbreviations . 2
4 Test target . 2
5 Printing . 4
5.1 Environmental conditions . 4
5.2 Procedures . 5
6 Sampling . 5
6.1 Reproducibility within a job . 5
6.2 Colour variation between jobs . 5
6.3 Colour variation between printed images located in different areas on a large sheet . 5
7 Measurement .6
7.1 Measurement device. 6
7.2 Timing of measurement . 6
7.3 Measurement conditions .
...

TECHNICAL ISO/TS
SPECIFICATION 20791-2
First edition
Photography — Photographic
reflection prints —
Part 2:
Evaluation of colour variation in
printing
Photographie — Tirages photographiques par réflexion —
Partie 2: Évaluation de la variation de couleur dans l'impression
PROOF/ÉPREUVE
Reference number
ISO/TS 20791-2:2021(E)
©
ISO 2021

---------------------- Page: 1 ----------------------
ISO/TS 20791-2:2021(E)

COPYRIGHT PROTECTED DOCUMENT
© ISO 2021
All rights reserved. Unless otherwise specified, or required in the context of its implementation, no part of this publication may
be reproduced or utilized otherwise in any form or by any means, electronic or mechanical, including photocopying, or posting
on the internet or an intranet, without prior written permission. Permission can be requested from either ISO at the address
below or ISO’s member body in the country of the requester.
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
ii PROOF/ÉPREUVE © ISO 2021 – All rights reserved

---------------------- Page: 2 ----------------------
ISO/TS 20791-2:2021(E)

Contents Page
Foreword .iv
Introduction .v
1 Scope . 1
2 Normative references . 1
3 Terms and definitions . 1
3.1 Terms . 2
3.2 Abbreviations . 2
4 Test target . 2
5 Printing . 4
5.1 Environmental conditions . 4
5.2 Procedures . 5
6 Sampling . 5
6.1 Reproducibility within a job . 5
6.2 Colour variation between jobs . 5
6.3 Colour variation between printed images located in different areas on a large sheet . 5
7 Measurement . 6
7.1 Measurement device . 6
7.2 Timing of measurement . 6
7.3 Measurement conditions .
...