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.
Created attachment 17286 [details] Example pdf
Created attachment 17287 [details] Compressed output tiff files I get
Definitely something wrong going on here. Will have a closer look next week.
Thanks for catching this. Fixed with https://git.ghostscript.com/?p=ghostpdl.git;a=commit;h=0129596f6cf2d090ed46f9a9c8189ab60b56735f