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Proceedings Paper

Accuracy of colour transforms
Author(s): Phil Green
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Paper Abstract

Colour management systems need to be accurate and repeatable, particularly in graphic arts applications such as converting image data to proofing systems and to final print processes. Modelling and computation errors were analyzed for a number of characterization data sets including single press sheet measurements and reference printing conditions based on SWOP and ISO 12647-3. Errors were calculated at double precision and compared with the AToB, BToA and round trip errors found in ICC profiles generated from the same data sets. Data sets which are averaged from measurements of multiple press sheets consistently performed better than transforms built from single-sheet measurements. A significant part of the transform error lies in the limited precision of computation. BToA transform errors averaging 1 ΔE*ab appear to be a reasonable expectation for well-formed data sets. This needs to be placed in the context of errors arising from measurement uncertainty and the variation in colour reproduction systems, which are considerably larger.

Paper Details

Date Published: 16 January 2006
PDF: 10 pages
Proc. SPIE 6058, Color Imaging XI: Processing, Hardcopy, and Applications, 605802 (16 January 2006); doi: 10.1117/12.649641
Show Author Affiliations
Phil Green, London College of Communication (United Kingdom)

Published in SPIE Proceedings Vol. 6058:
Color Imaging XI: Processing, Hardcopy, and Applications
Reiner Eschbach; Gabriel G. Marcu, Editor(s)

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