Re: U.S. Web Coated (SWOP) v2 using GCR or UCR?
Re: U.S. Web Coated (SWOP) v2 using GCR or UCR?
- Subject: Re: U.S. Web Coated (SWOP) v2 using GCR or UCR?
- From: bruce fraser <email@hidden>
- Date: Wed, 5 Apr 2006 07:46:29 -0700
At 8:52 AM +0100 4/5/06, matthew barlow wrote:
I am relatively new to this list, but I think I may be misunderstanding this
thread. The consensus appears to be that the Custom CMYK within photoshop
does not allow any changes?
No, CUstom CMYK lets you make changes, but not to any of the built-in
ICC profiles. Instead it uses a separate, much older model.
When you first open Custom CMYK, the Name field contains Ink Colors,
the Dot Gain, the Separation Type, and, if it's a GCR sep, the GCR
amount. Typically, the default Ink Colors are SWOP (Coated), but they
aren't the same ink colors found in the US Web Coated (SWOP) v2
profile.
The old Ink Colors have
Cyan = Lab 62 -31 -48
Magenta = Lab 48 83 -3
Yellow = Lab 94 -14 100
Black = Lab 0 0 0 (!)
US Web Coated (SWOP) v2 has
Cyan = Lab 62 -44 -50
Magenta = Lab 52 81 -7
Yellow = Lab 95 -6 95
Black = Lab 12 2 0
If I change, for example, the amount of black generation then I clearly get
a different black generation and the profile would be called Euroscale
coated(or whatever the start profile was) with the addition of whatever
changes I had made to the dot gain etc.
Actually, it would be named after whatever Ink Colors table you
started with, plus dot gain and KGen. It's completely divorced from
the ICC profiles.
--
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