Re: CMYK to RGB to CMYK
Re: CMYK to RGB to CMYK
- Subject: Re: CMYK to RGB to CMYK
- From: neil snape <email@hidden>
- Date: Fri, 02 Nov 2001 09:03:05 +0100
on 2/11/2001 04:02, Dave at email@hidden wrote:
>
I have CMYK files with CMYK coated profiles. If I convert them to RGB
>
and back to CMYK i get fairly significant changes - 10 to 15%. Have I
>
got something wrong or is this a common thing that has not been fixed
>
yet.
When going back to three color Colorsync asks for a conversion from the
device color to PCS then to the chosen working space. Some profiles have
good tables that preserve integrity. Others may use a more conservative
mapping that skews colors more. Also the CMM has an influence if slight on
the conversions.
If you're referring to the 10-15% change is that cmyk values while in rgb?
This would be your color set up, profiles chosen rendering etc. A great
guide to production information in Photoshop is Bruce Fraser's book Real
World Photoshop 6 available online thru Amazon.
Neil Snape email@hidden
http://mapage.noos.fr/nsnape