Re: epson 2200 > blackpoint compensation
Re: epson 2200 > blackpoint compensation
- Subject: Re: epson 2200 > blackpoint compensation
- From: Thomas Holm / Pixl <email@hidden>
- Date: Sun, 14 Dec 2003 22:24:25 +0100
Martin Muntenbruch wrote:
>
I heard and read everywhere the recommendation to turn this OFF. What's the
>
verdict from others on this list?
Depends on what you are doing.
For nice prints (using relative colorimetric) by all means use black point
compensation. For perceptual it won't make much difference as perceptual
does this by default.
For proofs turn it off.
>
>
And what does this checkbox actually do?
Black point compensation scales the blackpoint from your source space (lab
value) to the blackpoint of the destination. Good for nice looking prints,
but will ruin a proof (make it look too nice).
Suppose you want to print a 100 step grey wedge, in Adobe RGB (1998) which
has Lab values from L 0 (black) to L 100 (white).
The darkest black your 2200 can print is L 11 on the particular paper your
are using.
If you convert using perceptual or relative colorimetric with Black Point
compensation on, L 0 from your source will be scaled to L 11, and the rest
of the tonal scale will be adapted to fit in.
If you turn BPC off using RelCol all values between L 0-11 will be printed
as L11 effective killing all shadow detail.
Suppose you have a CMYK file separated for newsprint, where the maximum
black is L 28 on the newsprint. If you proof this (using RelCol or AbsCol)
and turn BPC off, the darkest black on your Epson (capable of printing L 11)
will be L 28. If you turn BPC on black will be scaled so the darkest black
will be L11. On will look nicer but won't resemble what you will see on
press.
In short, for nice looking prints turn BPC on, for proofing turn it off.
Best Regards
Thomas Holm / Pixl ApS
- Photographer & Colour Management Consultant
- Adobe Certified Training Provider in Photoshop.
- Apple Solutions Expert - Colour Management
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- Home Page: www.pixl.dk 7 Email: th[AT]pixl.dk
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