Re: Re(8): embedded profiles in PDF/Postscript
Re: Re(8): embedded profiles in PDF/Postscript
- Subject: Re: Re(8): embedded profiles in PDF/Postscript
- From: Roger Breton <email@hidden>
- Date: Sun, 06 Jun 2004 14:55:34 -0400
Olaf,
I found the entries on page 218, vielen danke.
I managed to create a PDF out of a Microsoft Word document in which I drew
some simple RGB objects with the drawing tools. I preflight the PDF in
Acrobat 6 Pro with the profile to "List all objects not 4c". I the preflight
report, under Color Spaces, I got the full CalRGB specs (I realize there is
more than only one kind of CalRGB space!):
White point = normalized D50 (0.9642 1.0000 0.8249)
Black point = XYZ = 0,0,0
GammaRGB = 1.8, 1.8, 1.8
GammaMatrix = (really the) RGB primaries of the color space =
Xr (0.4542) Yr (0.2431) Zr (0.0147)
Xg (0.3533) Yg (0.6746) Zg (0.0902)
Xb (0.1556) Yb (0.0821) Zb (0.7199)
The GammaMatrix expressed as chromaticities values =
Red: x (0.6379) y (0.3414)
Green: x (0.3160) y (0.6033)
Blue: x (0.1625) y (0.0857)
The GammaMatrix when translated to Lab values =
Red: L (56.4) a (76.99) b (72.58)
Green: L (85.7) a (-80.7) b (79.7)
Blue: L (34.4) a (54.9) b (-104.2)
The primaries look very close to P22-EBU primaries found in ColorMatchRGB:
Red: x (0.6300) y (0.3400)
Green: x (0.2950) y (0.6050)
Blue: x (0.1500) y (0.0750)
Does anyone recognizes the CalRGB primaries?
>
A CalRGB color space could be converted to an ICC RGB mntr profile I'd
>
say though I do not know of any tool that does so. The CalRGB mechanics
>
are based on the CIEBasedABC color space in PostScript Level 2 and
>
upwards, though in PostScript you can have more transforms than just one
>
set of transfer curves and one matrix.
So, CalRGB is one particular instance of a CIEBasedABC color space array?
Roger Breton | Laval, Canada | email@hidden
http://pages.infinit.net/graxx
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