Thread View: adobe.colormanagement
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Started by Bob_Mackey
Mon, 23 Mar 2009 14:43
Converting CMYK to RGB - How to?
Author: Bob_Mackey
Date: Mon, 23 Mar 2009 14:43
Date: Mon, 23 Mar 2009 14:43
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Posted on Acrobat for Windows Forum this morning - then found this group - Hope someone can help us... We are a small non-profit working with adults with developmental disabilities ramping up a very short run color printing service for other non-profits. We print/mail newsletters and brochures and give our adults work to do in our workshop setting. So we have purchased Acrobat Pro 9.0 - and all we want to do is be a printer of "print ready" pdf'S... Our knowledge of graphic arts and/or acrobat is very limited - we are just users and again, we want to print out submitted PDF's to our HP high end laser (HP CP6015dn) and give our clients great color printing. Most PDF files we receive work fine and we output what we see and that is what they get but now one client has sent us a file in CMYK and the color is off. I sent him some other PDF's we have used and he tells us our other files are all RGB so... Can we take his CMYK file and convert it to RGB and then print it out? If yes, can you explain it to us very simply? Thanks Bob
Re: Converting CMYK to RGB - How to?
Author: Gernot_Hoffmann
Date: Mon, 23 Mar 2009 15:44
Date: Mon, 23 Mar 2009 15:44
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Bob, the conversion of CMYK to any RGB isn't recommended, but in your case it's perhaps not bad, because you'll have then the same printing workflow for all PDFs: Acrobat Pro (tested for 7) > Tools > Print Production > Convert Colors: 1. Device CMYK > Convert > to Profile sRGB 2. Calibrated CMYK > Convert > to Profile sRGB 3. Grayscale > Convert > to Profile Gamma=2.2 4. Lab > Convert > to Profile sRGB x Embed Profile as Output Intent Execute for all pages Save As by new name Device CMYK is CMYK without a profile. Calibrated CMYK is CMYK with a profile. The CMYK PDF can contain one of them or both. Grayscale is doubtful. There is most likely no Lab in the PDFs. RGB destination space is for simplicity sRGB. Use eventually p.4 and 5 of this doc for printer tests: <http://www.fho-emden.de/~hoffmann/a3gencolorhigh.pdf> Best regards --Gernot Hoffmann
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