Bug 700929

Summary: dRenderIntent ignored for pdf pages, containing transparency
Product: Ghostscript Reporter: i3v
Component: Color ManagementAssignee: Michael Vrhel <michael.vrhel>
Status: RESOLVED FIXED    
Severity: normal    
Priority: P4    
Version: 9.26   
Hardware: PC   
OS: Windows 10   
Customer: Word Size: ---
Attachments: Example pdf
Compressed output tiff files I get

Description i3v 2019-03-31 18:20:47 UTC 
To demonstate the effect one need:

1) attached 2-page pdf. 
   The tex code is here: https://www.overleaf.com/read/bvkfbwhqzbtp .
   The only difference between the two pages is that the 2nd contains 
   small tikzpicture utilizing transparency.

2) `cmyk_des_renderintent.icc` from gs source:
   http://git.ghostscript.com/?p=ghostpdl.git;a=blob_plain;f=toolbin/color/src_color/cmyk_des_renderintent.icc;hb=d3537a54740d78c5895ec83694a07b3e4f616f61
   Based on https://www.ghostscript.com/doc/9.26/GS9_Color_Management.pdf :
   The profile cmyk des renderintent.icc is designed such that:
   * the perceptual rendering intent (0) outputs cyan only, 
   * the colorimetric intent (1) outputs magenta only 
   * and the saturation intent (2) outputs yellow only.


The following command:

>> gswin64c -sDEVICE=tiff32nc -dBATCH -dNOPAUSE -sProcessColorModel=DeviceCMYK -sColorConversionStrategy=CMYK -I. -sOutputICCProfile=cmyk_des_renderintent.icc -dRenderIntent=1 -sOutputFile=colorbar_intent1.tiff colorbar.pdf

renders both pages in magenta, as expected. 

However, same command with `-dRenderIntent=2` only makes the first page yellow.
Comment 1 i3v 2019-03-31 18:22:05 UTC 
Created attachment 17286 [details]
Example pdf
Comment 2 i3v 2019-03-31 18:23:10 UTC 
Created attachment 17287 [details]
Compressed output tiff files I get
Comment 3 Michael Vrhel 2019-04-12 04:55:41 UTC 
Definitely something wrong going on here.  Will have a closer look next week.
Comment 4 Michael Vrhel 2019-11-21 23:20:19 UTC 
Thanks for catching this.

Fixed with

https://git.ghostscript.com/?p=ghostpdl.git;a=commit;h=0129596f6cf2d090ed46f9a9c8189ab60b56735f