[gs-bugs] [Bug 698768] - Ghostscript - Black CMYK not resulting in 100% gray

[b***@artifex.com]

http://bugs.ghostscript.com/show_bug.cgi?id=698768

Bug ID: 698768
Summary: Black CMYK not resulting in 100% gray
Product: Ghostscript
Version: master
Hardware: PC
OS: Windows 7
Status: UNCONFIRMED
Severity: normal
Priority: P4
Component: Color Management
Assignee: ***@artifex.com
Reporter: ***@artifex.com
QA Contact: gs-***@ghostscript.com
Word Size: ---

Created attachment 14476
--> http://bugs.ghostscript.com/attachment.cgi?id=14476&action=edit
custoemr supplied file

The customer is currently using -dUseFastColor, but if I omit that parameter
then the resulting rendered output is only pure black when rendering to a
32-bit CMYK device.

In particular, when rendering to a monochrome device such as the tiffg3 device,
the output is halftoned, which is a significant problem for legibility at such
low resolution.

gs -sDEVICE=tiffg3 -sOutputFile=out.tif Input.ps

shows the problem.

While its obviously not a problem for the customer currently, I can't help
feeling that C=M=Y=0, K=1 should not result in gray values.

[b***@artifex.com]

http://bugs.ghostscript.com/show_bug.cgi?id=698768

Ken Sharp <***@artifex.com> changed:

What |Removed |Added
----------------------------------------------------------------------------
Priority|P4 |P2
Customer| |999999

--- Comment #1 from Ken Sharp <***@artifex.com> ---
By the way, feel free to tell me I'm doing it wrong, I'm happy to accept an
amended command line.