Ghostscript To Convert Graphics To Rich Black When Converting To CMYK

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Learn more about Labs Ghostscript to convert graphics to rich black when converting to CMYK Ask Question Asked 6 years, 6 months ago Modified 6 years, 6 months ago Viewed 370 times 2

I'm using Ghostscript 9.22 to convert a PDF to CMYK, but can't seem the get the right CMYK-values for a black colored graphic object:

• input PDF (rgb): contains 2 images and 1 (black, R: 0%, G: 0%, B: 0%) graphic.
• output PDF (cmyk): images are converted correctly, but the black color of the graphic is: C: 100%, M: 100%, Y: 100%, K: 0%:

I need to have the black of the graphic set to specific values:

C: 0%, M: 0%, Y: 0%, K: 100%

or

C: 75%, M: 68%, Y: 67%, K: 90% (rich black)

Any idea how I can realise this?

This is the Ghostscript command used:

gs -dBATCH -dNOPAUSE -q -sDEVICE=pdfwrite -sOutputFile=output-cmyk.pdf -sColorConversionStrategy=CMYK -dAutoFilterColorImages=false -dAutoFilterGrayImages=false -dAutoFilterMonoImages=false -dColorImageFilter=/FlateEncode -dGrayImageFilter=/FlateEncode -dMonoImageFilter=/FlateEncode -dDownsampleGrayImages=false -dDownsampleColorImages=false -dDownsampleMonoImages=false input-rgb.pdf

• pdf
• ghostscript
• graphic
• cmyk

Share Improve this question Follow asked Jun 15, 2018 at 13:38 Adriaan MeurisAdriaan Meuris 38122 silver badges1414 bronze badges Add a comment | Related questions 15 Script (or some other means) to convert RGB to CMYK in PDF? 2 How to convert CMYK eps to CMYK jpeg with ghostscript? 2 Ghostscript: Convert PDF into CMYK EPS Related questions 15 Script (or some other means) to convert RGB to CMYK in PDF? 2 How to convert CMYK eps to CMYK jpeg with ghostscript? 2 Ghostscript: Convert PDF into CMYK EPS 3 How to programmatically convert a PDF to grayscale using only black ink? 2 Need to generate separate CMYK images in color from PDF 6 ghostscript: convert PDF into CMYK preserving pure Black for text 1 Ghostscript in Linux: CMYK PDF to CMYK EPS 1 ghostscript: convert PDF into GRAY preserving pure Black for text 0 How can I convert an RGB PDF to CMYK with flat black? 0 Ghostscript convert cmyk-PDF to rgb-PNG and preserving correct colors Load 7 more related questions Show fewer related questions

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