Re: Dumb question - Printing Colorchecker
Re: Dumb question - Printing Colorchecker
- Subject: Re: Dumb question - Printing Colorchecker
- From: <email@hidden>
- Date: Thu, 27 Oct 2005 10:18:52 -0400
Please note that Edmund's TIF file is encoded in Adobe RGB
(D65), not L*a*b* (even though, as he mentioned, I checked
the values in L*a*b* D50, as converted by Photoshop info).
This may explain the apparent contradiction between what
should be done and what is seen.
To print this RGB D65 image would then require Rel. Col.,
which corresponds to Edmund's neutral output.
The blue tint when printing with Abs. Col. also
corresponds to a D65 white printed relative to D50
printing environment.
Danny
On Wed, 26 Oct 2005 22:48:40 -0700
Steve Upton <email@hidden> wrote:
At 3:52 AM +0200 10/27/05, edmund ronald wrote:
Roger, in the mean time, Danny Pascale has confirmed that
my spectral
values and LAB values match the colorchecker tiff aRGB
file that I
tried to print. Apart from one square (blue) which may be
a
manipulation mistake.
Now how do I print this thing ? The colors look in-gamut
when viewing
the profile. Why do the neutral square go blue with abs
col and stay
neutral with rel col ? I don't get it ...
The big difference is that Adobe RGB has a blue white
point so abs col reproduces the blue white point in the
output space. Lab has a D50 white point which doesn't.
So, using Lab values with abs col is much more likely to
give you the results you want.
Also, are you measuring or viewing to find the
difference? If viewing, make sure you don't have an odd
white surround casting everything.
Regards,
Steve
________________________________________________________________________
o Steve Upton CHROMiX
www.chromix.com
o (hueman) 866.CHROMiX
o email@hidden 206.985.6837
o ColorGear ColorThink ColorValet ColorSmarts
ProfileCentral
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