[argyllcms] Absolute colorimetric - dark saturated colours excessively light

Hi,

I've been experimenting with various paper types on my R300 and hit a
snag with the Absolute Colorimetric intent and my profiles.

The problem concerns very dark, saturated colours becoming excessively
light when transformed to a profile with poor black density.

Here are some images to illustrate the problem.  Note particularly
columns 2, 3 and 4.

Firstly, the IT8 target, as scanned on my Perfection 640 and transformed
to sRGB with Argyll.

http://i14.photobucket.com/albums/a346/robinsonb5/IT8_sRGB.jpg

For the following files, I did an absolute colorimetric transform from
the scanner's profile to the printer profile, saved as a temp file, then
transformed that from the printer file to sRGB, again as absolute
colorimetric. Thus a side-by-side comparison of the final file on-screen and a print should match pretty well, which it does.

Firstly, 7DayShop glossy, which has excellent dense black:
http://i14.photobucket.com/albums/a346/robinsonb5/IT8_Glossy_Proof.jpg

Then Tesco matte inkjet paper, not far behind the glossy.  Note columns
2, 3 and 4 becoming lighter:
http://i14.photobucket.com/albums/a346/robinsonb5/IT8_Tesco_Proof.jpg

Finally, bog-standard plain paper:
http://i14.photobucket.com/albums/a346/robinsonb5/IT8_Plain_Proof.jpg

Any ideas what's going on here?  Should I be able to solve this by
fiddling with the profile program's parameters?

(I can let you have TI3s for all four profiles if you want to see them...)

All the best,
--
Alastair M. Robinson


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