RE: CMYK changes with Photoshop?
RE: CMYK changes with Photoshop?
- Subject: RE: CMYK changes with Photoshop?
- From: "Robert Rock" <email@hidden>
- Date: Fri, 13 Oct 2006 10:33:14 -0400
- Organization: P. Chan & Edward, Inc.
Jouni,
The file will NOT change if you use "Baseline Standard" JPG. ONLY when you
use "Baseline Optimized" does it change the file. Why? I don't know. But I'm
assuming that even with optimal quality and seemingly NO COMPRESSION, there
is indeed SOME kind of compression or file altering going on in the
OPTIMIZED form of JPG conversion.
Perhaps someone more familiar with the nuances of JPG file formats can shed
more light on this. But if you want the file UNCHANGED, use Baseline
Standard with maximum quality.
Regards,
Bob Rock
-----Original Message-----
From: colorsync-users-bounces+bobrock=email@hidden
[mailto:colorsync-users-bounces+bobrock=email@hidden] On
Behalf Of email@hidden
Sent: Friday, October 13, 2006 2:48 AM
To: email@hidden
Subject: CMYK changes with Photoshop?
Hello list
Has anyone run into this kind of behaviour with Photoshop CS2 (or is this
commonly known?)
Create a new untagged CMYK file and put there areas containing C100% M100%
and M100%Y100%. Save the file as jpeg - open it again and the areas have
changed to C100%M100%Y1% and M100%Y100Á%. Photoshop (or
jpeg) adds 1% of cyan or yellow to areas. Same behaviour does not happen
when saving as tiff
Jouni Marttila
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