Re: Of a wish for Pshop 7 /black point compensation / Simulate Ink Black
Re: Of a wish for Pshop 7 /black point compensation / Simulate Ink Black
- Subject: Re: Of a wish for Pshop 7 /black point compensation / Simulate Ink Black
- From: Josef Fallnhauser <email@hidden>
- Date: Thu, 05 Jul 2001 15:30:23 +0200
Henrik Holmegaard wrote:
>
The issue in the post has to do with the current craze for converting
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with relative colorimetric from RGB working space into CMYK
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simulation and default output space.
>
>
This is not a safe conversion, because if Black Point Compensation is
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not checked, the difference between the RGB working space black and
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the black of the CMYK space is clipped. For paper type 3 lightweight
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coated magazine stock you clip 15 steps of detail. For newsprint you
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clip 40 steps of detail. Meaning all detail goes to black. Relative
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Colorimetric with Black Point Compensation makes the black point
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relative and more shadow detail is preserved. Perceptual maintains
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detail and contrasts even in massive compression contexts.
>
> If I do so, the preview looks terrible - all over a white cast. I can't
>
> believe that this is your opinion of how a preview should look like.
First of all - I said this because you wrote in a mail before the following:
"Users should learn never ever to work without enabling View > Proof Setup >
Custom > Simulate Ink Black. ..........."
So I did not make a comment to turn black point compensation on or not, my
comment was to your saying to turn "Simulate Ink Black" on!
>
I'm not sure it makes sense to ask what a preview 'should' look like.
>
There is no one way it should look because black looks different on
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different papers.
Correct, but as you now, when you compare two different black sheets, maybe
one look darker than the other. When you only look at one, you don't see a
difference and the one you look at, appears as a completely black one to
you.
What I want to say is, that on the monitor, also with a profile were black
is only L 23, black should appear as black on the monitor surface and not as
gray. On a print were black is only L 23 the black would look like black and
not like gray as it does on the monitor. (I remember something like WYSIWYG)
Josef
-----------------------------------------------------
Josef Fallnhauser (c/o Studio Trizeps)
Zollergasse 13/9
A-1070 Wien / Austria
Tel: +43(1)5263393 Fax: +43(1)5266020
www.trizeps.com
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