Alastair M. Robinson wrote:
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?
Alastair,
Regards, Gerhard
(I can let you have TI3s for all four profiles if you want to see them...)
All the best, -- Alastair M. Robinson