Legacy ImageMagick Discussions Archive

Input (CMYK PDF):

http://www.fmwconcepts.com/misc_tests/p ... s-test.pdf

This works fine in IM 7

magick -depth 8 -colorspace sRGB trans-test.pdf -alpha extract mask.png
magick \( -depth 8 -colorspace CMYK trans-test.pdf \) \
mask.png -alpha off -compose CopyOpacity -composite \
trans-test_mask7.tif

http://www.fmwconcepts.com/misc_tests/p ... _mask7.tif

But this fails in IM 6

Code: Select all

convert -depth 8 -colorspace sRGB trans-test.pdf -alpha extract mask.png
convert \( -depth 8 -colorspace CMYK trans-test.pdf \) \
mask.png -alpha off -compose CopyOpacity -composite \
trans-test_mask6.tif

http://www.fmwconcepts.com/misc_tests/p ... _mask6.tif

Same version of Ghostscript: 9.23

Mac OSX Sierra

Per the porting guide, alpha is reversed for IMv6 and IMv7-- so negate the mask for iMv6:

Code: Select all

convert \( -depth 8 -colorspace CMYK trans-test.pdf \) \
  \( mask.png -negate \) -alpha off -compose CopyOpacity -composite \
  trans-test_mask6.tif

Thanks. I forgot about that. Sorry, for the false alarm.

Legacy ImageMagick Discussions Archive

Possible bug IM 6.9.9.49 vs 7.0.7.37 converting CMYKA PDF to CMYKA TIFF

Possible bug IM 6.9.9.49 vs 7.0.7.37 converting CMYKA PDF to CMYKA TIFF

Re: Possible bug IM 6.9.9.49 vs 7.0.7.37 converting CMYKA PDF to CMYKA TIFF

Re: Possible bug IM 6.9.9.49 vs 7.0.7.37 converting CMYKA PDF to CMYKA TIFF