[argyllcms] Re: RGB Printer Profiling / Issues with Blacks and Shadows
- From: Andreas Hebeisen <fotografie@xxxxxxxxxxxx>
- To: argyllcms@xxxxxxxxxxxxx
- Date: Sat, 6 Aug 2011 19:34:12 +0200
Hallo Klaus
On 06.08.2011, at 18:03, Klaus Karcher wrote:
> Andreas Hebeisen wrote:
>> Sadly, the problem didn't go away. The behavior of the modified profiles is
>> the same.
>
> ... hmmm ... What are the L-values you measure in the black patch in the top
> right corner of your prints (perceptual without BPC)?
I read the values using 'spotread' from ArgyllCMS, OK?
Sample of a very good print (ArgyllCMS profile, Lightroom, Perceptual):
D50 Lab: 16.826835 0.838703 1.486442
Sample of an Aperture 3.1.3 print with ArgyllCMS profile:
D50 Lab: 24.134904 0.224252 2.315157
> According to the density values you report the differences must be quite
> dramatic.
>
> What happens when you use this profile
> <http://digitalproof.info/argyll/2011_V6_test.icc.zip>
> to print from Aperture and one of the other Applications (perceptual without
> BPC in both cases)? What are the L-values of the black patch? Are there any
> abnormalities in the /prints/? (please ignore any abnormalities in previews
> or softproofs -- just look at the prints)
Printed from Photoshop CS 5:
The print looks OK, compared to another print made with an ArgyllCMS-profile,
Photoshop etc. they're very, very close.
Sample patch reads:
D50 Lab: 18.765331 0.820211 1.448157
(Since this is a fresh print, the black patch isn't as dark as it could be.
But this is OK. Within 24 to 48 hours it will become darker and will finally
reach a value close to the print I listed first.)
And finally the Aperture 3.1.3 Print:
This is the ugliest print I've ever got from my machine. ;)
There are just reds and yellows. But when I look at the LAB visualization in
ColorSync, this seems to be what you've intended.
Sample patch reads:
D50 Lab: 47.894951 67.564971 36.821702
Now I'm anxious to hear your conclusions from this test.
Cheers
Andreas
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