Re: [Lcms-user] Lcms-user Digest, Vol 34, Issue 6

[Ignacio Ruiz-de-C. <ign...@si...>]

Hi:

I have place a 300K .rar file with profiles,  the small program to 
generate them, and results (in excel)  under
http://drop.io/cmyk200_rar
My best candidate (to print srgb images with 0, 200 or 400% ink) is a 
profile with 33 nodes and prelinearization curves. 65-node improvements 
are barely noticeable, as the post-linearization curves, which add noise 
(encoding issues?)

I know I am trying to use the ICC mechanism in a way it was not designed 
for (your hint of a full populated LUT, Guy, would involve a device 
link, but I need an output profile, from PCS to CMYK. Note: there is an 
artificial limit of 100 for the number of nodes in the LUT in lcms' 
code). At this stage, I feel that interpolation and encoding (thanks, 
Marti!) will prevent me from obtaining the results I am seeking, but I 
can accept the limitations and just take note of those RGB areas that do 
not behave as desired. There are points that remain unclear to me (weird 
local behaviours, specially when two RGB primaries are almost saturated, 
which has nothing to do with the LAB space in which I am defining the 
nodes!), but need to move forward.

Thank you all,

          Ignacio

> Possibly posting a link to your profile(s) would help.
> For most OSes exist profile inspection tools to see a nLUT, at least 
> for version 2.x. For the ICC version 4.x it may differ.
>
> I've recently played with http://drop.io which seems fantastic for the purpose 
> of sharing and collaborative access to files.
>
>   

-- 
______________________________________________________________
Ignacio Ruiz de Conejo
Senior Imaging Researcher
Tel.  : +61 28875 9682
e-mail: ign...@si...
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