Hi
If you open the source image in photoshop and examine it with the color
picker, you will see all pixels do have L*=0
lcms 1.x assumes this is black, no matter the chroma.
lcms 2.0 does not make such assumption, it gives a result equal to the
Adobe and MS samples you sent.
The first beta will be available in a day or two.
Regards
Marti.
Esben Høgh-Rasmussen wrote:
Hello,
I have tried to use lcms for some conversions, but I stumbled over an
example where it appears to do a poor job.
It is an image from a digital camera and I want to convert it to
sRGB (or something) using a color profile (embedded):
ftp://updates.phaseone.com/prerelease/Images/lcms/In-16bit.tif
It is a rather dark and outside the profile gamut, but it renders well
using Microsoft, Adobes and Apples color management engines.
Here are conversions using Adobe, Microsoft and LCMS:
http://updates.phaseone.com/prerelease/Images/lcms/Out-16bit-sRGB-Adobe.tif
http://updates.phaseone.com/prerelease/Images/lcms/Out-16bit-sRGB-Microsoft.tif
http://updates.phaseone.com/prerelease/Images/lcms/Out-16bit-sRGB-LCMS.tif
Black-poiont compensation was turned off on the Adobe conversion
(performed by PhotoShop).
The Microsoft engine was performed using native calls.
This particular conversion was created with the
flags cmsFLAGS_HIGHRESPRECALC | cmsFLAGS_BLACKPOINTCOMPENSATION, but I
tried just about any permutation and the problem is basically the same
regardless of intent.
Just to check I am not completely insane I tried to do the conversion
in Gimp (based on LCMS).
First I converted to 8-bit in PhotoShop and then did the conversion in
both:
http://updates.phaseone.com/prerelease/Images/lcms/Out-8bit-sRGB-Adobe.tif
http://updates.phaseone.com/prerelease/Images/lcms/Out-8bit-sRGB-GIMP.tif
Same result, so I conclude that this is how LCMS handles the conversion.
Is there a way to solve this issue?
Kind regards,
Esben Høgh-Rasmussen Myosotis
Software Engineer
Phase One A/S
Roskildevej 39
DK-2000 Frederiksberg
Denmark
Phone: + 45 36 13 12 07
Fax.: + 45 36 46 02 22
Mobile: + 45 28 51 10 79
E-mail: e...@phaseone.com <mailto:e...@phaseone.com>
www.phaseone.com <http://www.phaseone.com/>
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