the imagemagick (im) result of command
convert myrgb.png -colorspace cmyk cmyk.pdf <br> is not bright or close screen colors photoshop produced cmyk pdf. myrgb.png png file produced using gimp.
don't own photoshop, , stick open source tools. current ubuntu release of of im 6.7.7. im version produces dark, totally unusable, cmyk pdf.
built 7.0.2-6 q16 source on ubuntu 14.0.4, after building lcms package source, , above command works better, cmyk pdf stated above less bright , less close screen colors similar photoshop output. e.g. blacks not totally black; sky color dull blue instead of bright blue/cyan.
i've tried using icc files downloaded adobe in following
convert myrgb.png -colorspace cmyk -profile webcoatedswop2006grade5.icc cmyk.pdf i've tried command 14 adobe icc files , there no difference in of them. although, admit not understand under circumstances icc comes play or if appropriate problem @ all.
the simple question why im convert tool not match photoshop results cmyk?
second question is, if im can't made it: there open source tool or tools can match photoshop results producing cmyk pdf , rgb png?
there 2 applications involved, presumably know since tagged ghostscript. haven't said version of ghostscript have installed first thing remove imagemagick equation.
find out whether im having ghostscript produce rgb or cmyk output, bet is getting rgb gs. you'll need find out ghostscript command line im using , can't tell how that. assuming ghostscript output rgb explain why altering im settings makes no difference.
proceeding on assumption above correct, use png16m device in ghostscript produce rgb png files directly, reduces scope of problem:
gs -sdevice=png16m -o out.png input.pdf now, don't version of ghostscript have installed, assuming relatively recent can in /ghostpdl/doc directory , find considerable information on using colour management in ghostscript, document gs9_color_management.pdf may helpful. give myriad of opportunities alter output.
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