From 3db384424bd7398ffbb7a355cab8f15f3add009f Mon Sep 17 00:00:00 2001 From: =?UTF-8?q?J=C3=B6rg=20Frings-F=C3=BCrst?= Date: Sun, 2 Oct 2016 19:24:58 +0200 Subject: New upstream version 1.9.1+repack --- doc/ArgyllCMS_arts_tag.html | 26 ++++++++++++++------------ 1 file changed, 14 insertions(+), 12 deletions(-) (limited to 'doc/ArgyllCMS_arts_tag.html') diff --git a/doc/ArgyllCMS_arts_tag.html b/doc/ArgyllCMS_arts_tag.html index 826aa30..8b9c445 100644 --- a/doc/ArgyllCMS_arts_tag.html +++ b/doc/ArgyllCMS_arts_tag.html @@ -53,10 +53,10 @@ The ICC standard "Wrong Von Kries" chromatic transform for media white to/from PCS D50 has disadvantages in regard to color behavior - for Output (i.e. print) profiles as well as Display profiles though. - With most normal, white media this is not of great significance, - since the white point shift is small, but it grows in significance - as the color of the paper differs from white (i.e. tinted papers).
+ for Output (i.e. print) profiles as well as Display profiles. With + most normal, white media this is not of great significance, since + the white point shift is small, but it grows in significance as the + color of the paper differs from white (i.e. tinted papers).

For all these reasons, and in the pursuit of the best possible color quality, ArgyllCMS uses the more color accurate Bradford chromatic @@ -70,17 +70,17 @@ noticeable with tinted stock, while having minimum incompatibility with Output profiles created for normal, white printed media by other profiling programs because the white point shift is typically - small. But to enable perfect compatibility of ArgyllCMS Output (i.e. + small (But to enable perfect compatibility of ArgyllCMS Output (i.e. print)  profiles with other CMM's, the default behavior can be changed by using the ARGYLL_CREATE_WRONG_VON_KRIES_OUTPUT_CLASS_REL_WP - environment variable.
+ environment variable).

So the problem is that it is impossible to know for sure whether an - ArgyllCMS create profile, ICC V2 Display profile, or other ICC - profiles has used a Bradford or "Wrong Von Kries" chromatic - transform in computing Absolute to/from Relative white point - transform.
+ ArgyllCMS create profile, ICC V2 Display profile, or other widely + used ICC profiles such as sRGB or AdobeRGB has used a Bradford or + "Wrong Von Kries" chromatic transform in computing Absolute to/from + Relative white point transform.

The solution

The ArgyllCMS SigAbsToRelTransSpace 'arts' tag holds a 3x3 matrix in the first 9 elements* of a SigS15Fixed16ArrayType in the @@ -105,7 +105,7 @@ href="Environment.html#ARGYLL_CREATE_WRONG_VON_KRIES_OUTPUT_CLASS_REL_WP">ARGYLL     7:  -0.06849670
    8:  1.02960205
- In contrast, ICC standard behavior is the equivalent of a unit + In contrast, ICC standard behavior is the equivalent of a unity matrix.

[ Note that ArgyllCMS will write an 'arts' tag containing a Bradford @@ -142,7 +142,9 @@ href="Environment.html#ARGYLL_CREATE_WRONG_VON_KRIES_OUTPUT_CLASS_REL_WP">ARGYLL the elimination of all ambiguity when the 'arts' tag is present, allowing CMM and profile creators to use the preferred Bradford (or other Sharpened Cone) space for Von Kries chromatic adaptation of - the media white point to/from PCS D50.
+ the media white point to/from PCS D50, and provide perfect + compatibility for the widely used sRGB and AdobeRGB profiles and + similiar.

Conclusion

The 'arts' tag allows unambiguous use of the recommended Bradford cone space transform in computing the Absolute Colorimetric (Media -- cgit v1.2.3