Re: What rendering intent for RGB to CMYK and for proofing on Epson RGB printer?
Re: What rendering intent for RGB to CMYK and for proofing on Epson RGB printer?
- Subject: Re: What rendering intent for RGB to CMYK and for proofing on Epson RGB printer?
- From: Marc Levine <email@hidden>
- Date: Wed, 06 Feb 2002 18:47:50 -0500
Andrew,
There definitely is a lack of standardization regarding the perceptual
intent. And, when going to a wide gamut device such as a pictography, or a
lambda, you can get excellent results using either (and sometimes superior
results with Colorimetric). However, I think you would agree that when going
to a much smaller gamut device (such as an offset press as indicated in the
original posting) Relative Colorimetric can deliver unsatisfactory results
due to breaks in tonality. Maybe it's better to say that in high
gamut-compression transformations (RGB file to offset press, for example),
perceptual typically does a better job. And, in transformations with little
or no compression, relative colorimetric will typically do a better job.
With regards to BPC, it's easy to see that the data is dramatically altered
by checking this selection using the eyedropper. I use ICC Tools
ProfileViewerPro to check the internal construction of my profiles. You can
see that the reported data matches the data in Photoshop with BPC off. Maybe
it's just a personal thing, but I like knowing that my profile is the only
thing managing my color.
-Marc
--
Marc Levine
Monaco Systems
Technical Manger
Sales Division
www.monacosys.com
>
From: Andrew Rodney <email@hidden>
>
Date: Wed, 06 Feb 2002 16:14:32 -0700
>
To: Marc Levine <email@hidden>, <email@hidden>
>
Subject: Re: What rendering intent for RGB to CMYK and for proofing on Epson
>
RGB printer?
>
>
on 2/6/02 2:04 PM, Marc Levine at email@hidden wrote:
>
>
> In general, a first print should use perceptual as it give the most natural
>
> look to an image.
>
>
I disagree. Plus why peg an intent when you can see what they do before
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doing the dead? You can set up a soft proof for one profile and several
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intents and see image by image which intent will work best. In many cases,
>
Perceptual is not the best way to work. If you don't have a lot of out of
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gamut mapping to do, Relative will do a superior job. Some vendors of ICC
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profiling software have a better (different?) recipe for perceptual
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rendering than others. There is no spec at all and they are free to do as
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they please. I find that with Photoshop 6, nine times out of ten, I'll go
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with a Relative Colorimetric intent based on the soft proof I see when I set
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up new View or when I use the Convert to Profile command (which allows a
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user to toggle the intents and simply hit OK when they see what they like.
>
>
> One more thing, always leave BPC off.
>
>
I don't think you'll get many people agreeing with this one either!
>
>
Andrew Rodney
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