[argyllcms] Perceptual intent black problems

Hello,

I am trying to make a profile for Epson SP4800 ( Luster 300g paper ) and i
have big problems with printing shadows using perceptual intent.
I used Adobe1998 as source profile for gamut mapping and I loose details in
the shadow areas because of the black generation.
I am attaching two screenshots of the test image displayed with the black
channel turned off :
-the first is one is using a profile generated with black limit 90
-the second one is using a profile generated with black limit 70.
The other parameters used are: 240 total ink limit, 0-100 black generation
with 0.5 shape ( I didn't want to 'hide' the black generation ).

For me it seems there is something wrong in the black generation, in how it
substracts the levels of CMY. How can I control better the black generation?
I only want a smooth curve that would not destroy the details.
Using Gretag ProfileMaker showed a much more moderate black generation
although I have used the same parameters. I also saw the following controls
in the separation page: "Black width" and "Neutralize". Are there similar
functions in Argyll?



Thank you!

Attachment: 90blimitCMY.jpg
Description: JPEG image

Attachment: 70blimitCMY.jpg
Description: JPEG image

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