Bug 694731 - Spot colors with alternative color space in CIE LAB are rendered black
Summary: Spot colors with alternative color space in CIE LAB are rendered black
Status: RESOLVED FIXED
Alias: None
Product: Ghostscript
Classification: Unclassified
Component: Color Management (show other bugs)
Version: master
Hardware: PC Windows 8
: P4 critical
Assignee: Michael Vrhel
URL:
Keywords:
Depends on:
Blocks:
 
Reported: 2013-10-22 09:24 UTC by Gennady Petrov
Modified: 2013-10-23 16:01 UTC (History)
0 users

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Attachments
Pantone 355 C green color with LAB alternative definition (top) rectangle is rendered black by GS 9.10. The same standalone LAB color is rendered correctly - green. (49.64 KB, application/postscript)
2013-10-22 09:24 UTC, Gennady Petrov 		Details
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Description Gennady Petrov 2013-10-22 09:24:57 UTC 
Created attachment 10344 [details]
Pantone 355 C green color with LAB alternative definition (top) rectangle is rendered black by GS 9.10. The same standalone LAB color is rendered correctly - green.

Spot colors defined via Separation colorspace with alternative color space as CIE LAB are rendered as black by GhostScript. The same PS file is rendered correctly in Distiller/Acrobat Reader/Pro or when processed by Global Graphics gDoc. The same standalone LAB color is rendered correctly by GS. This is a regression introduced at some point after GS 8.64.
Test PS file is attached. The test file is generated by CorelDraw, the bug is present with PS content generated by AI and ID as well, when LAB is used to define spot colors. As it affects rendering of many Pantone spot colors the issue is serious enough to prevent GhostScript use in spot color workflows.