[argyllcms] Re: RGB Printer Profiling / Issues with Blacks and Shadows
- From: "Alan Goldhammer" <agoldhammer@xxxxxxxxxxx>
- To: <argyllcms@xxxxxxxxxxxxx>
- Date: Thu, 04 Aug 2011 08:19:48 -0400
Graeme,
Thanks for checking Andreas's profiles. The black patch readings are right
about what I get when profiling matte papers. Something strange must be
happening with Aperture as was noted yesterday in terms of it being able to
print with a color managed workflow since other software works correctly.
Alan
-----Original Message-----
From: argyllcms-bounce@xxxxxxxxxxxxx [mailto:argyllcms-bounce@xxxxxxxxxxxxx]
On Behalf Of Graeme Gill
Sent: Thursday, August 04, 2011 5:24 AM
To: argyllcms@xxxxxxxxxxxxx
Subject: [argyllcms] Re: RGB Printer Profiling / Issues with Blacks and
Shadows
Andreas Hebeisen wrote:
> When I print the evaluation image mentioned above, I don't get the blacks
and shadow
> details I'm looking for on this matte paper. The problem already shows up
in the
> softproof view of Aperture and remains when the (matte black) ink hits the
paper. In
> the attached image, I've tried to visualize the problem. It contains a
crop from the
> bottom left corner of the evaluation image with different profiles and
render intent
> settings.
Hi,
it doesn't look to me like a problem with the Argyll profile. The
black patch
(131) has a value:
R G B X Y Z L a b
131 "Y15" 0.0000 0.0000 0.0000 2.3593 2.4032 1.8365 17.475 0.86838 1.4520
icclu -ff -ia -pl 2011_V6-0_3800mk_Epson-EMP_EMP_1440_0_8bit.icc
0.000000 0.000000 0.000000 [RGB] -> Lut -> 17.420737 1.009836 0.880059 [Lab]
so the profile forward behahaviour is pretty close.
At a guess there is something odd going on with the CMM. Perhaps the
input profile black point is being treated oddly ? (Not unusual
when it comes to RGB/matrix profiles, and the various changes in the ICC
spec. in regards to this aspect). What happens if you use the sRGB
profile from the Argyll distribution as the source colorspace ?
Graeme Gill.
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