Digital Watermarking by Chandramouli Memon Rabbani

By Chandramouli Memon Rabbani

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From the discussion above it will be clear that both media differences and image content affect the perceived quality of the color re-rendering, and separating these in any study is not easy. If both are included in the study it will generally be necessary to evaluate large numbers of images (maybe several hundred) before coming to a reasonable conclusion as to an optimum algorithm. The ICC sRGB v4 profile, for example, went through exhaustive testing by ICC members before it was adopted as a recommended solution to the perceptual intent transform from sRGB to the Perceptual Reference Medium Gamut.

Interoperability problems arose as profiles from different sources made different assumptions and sometimes did not work well together. To make matters worse, CMMs (Color Management Modules) could produce different results depending on how they dealt with inconsistencies in the profiles. Experience showed that there were issues with the colorimetric and perceptual rendering intents. In the colorimetric intents, the mediaWhitePoint tags were sometimes incorrectly encoded, that is, without applying an appropriate chromatic adaptation transform.

An introduction to the ICC profile is published by the ICC [2]. 1:2004–10 [3]) was published in late 2004. This version was approved by ISO TC 130 and published as ISO 15076-1 in 2005 [4]. 2 to incorporate the errata, resulting in the ICC version available being identical to ISO 15076-1. 2, the ICC has approved a number of amendments, and these are reviewed in more detail below. 3 (ISO 15076-1:2010) specification, together with some further rewriting of the specification to reduce ambiguity. 2 Changes in v4 The ICC v4 major revision was necessary because it had become apparent that the v2 specification [3] gave rise to a number of problems.

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