Bug 650802

Summary:	Wrong CIE color rendering
Product:	Ghostscript	Reporter:	Igor Melichev <igor.melichev>
Component:	Graphics Library	Assignee:	Dan Coby <dan.coby>
Status:	NOTIFIED FIXED
Severity:	normal	CC:	dcarlin
Priority:	P2
Version:	master
Hardware:	All
OS:	All
Customer:		Word Size:	---
Attachments:	sRGB CRD patch

Description Igor Melichev 2002-12-09 03:27:15 UTC

Originally reported by: igorm@users.sourceforge.net
Regarding to the test file hack3[1].eps attached to bug 
#647124 :

GS renders it to display with slightly blue background.
Adobe CPSI paints it with white background.
Distilled with Adobe Distiller 5.0 and viewed with Acrobat 
reader 4 and 5 renders white background.
So it's an incompatibility.

The document sets /WhitePoint [0.9642 1.0000 0.8249]. 
Probably something is wrong in GS with mapping the 
white point to device color.

Comment 1 Alex Cherepanov 2003-04-03 09:54:29 UTC

Default Ghostscript CRD does chromatic adaptation in RGB color space.
This is definitely wrong. In practical terms it means that
/MatricPQR is missing from the CRD.

HP has published a public domain CDR for sRGB color space.
http://www.srgb.com/postscript/srgbpscrd.htm
My patch is similar to sRGB but uses C implementation of TransformPQR

Comment 2 Alex Cherepanov 2003-04-03 09:57:37 UTC

Created attachment 64 [details]
sRGB CRD patch

Comment 3 Alex Cherepanov 2003-04-10 09:42:34 UTC

The patch is committed to HEAD branch.

Comment 4 Dan Coby 2003-04-10 12:46:38 UTC

*** Bug 686752 has been marked as a duplicate of this bug. ***