[argyllcms] Re: Profile tweaking with refine

  • From: "Kamil Tresnak" <kamil.tresnak@xxxxxxxxx>
  • To: argyllcms@xxxxxxxxxxxxx
  • Date: Mon, 28 May 2012 21:17:59 +0200

Thanks for reply, but seems to me that out of gamut colors are not the case. With both the way you recommended and comparing profiles in the Monaco GamutWorks i get nearly the same result: there are few colors in ISOcoated_v2_eci, which are out of gamut of my proofer, but mostly not in the areas where i have problems. 

I take some screenshots with intuitive names.
In this particular case, i will make new "original" profile with higher quality settings and suppose that i get satisfying results without need of improving, but i am really curious, what i am doing wrong.
What results are others getting? What is "typical" shift with improved profile? (I know, this is a dumb question if we not have any real data, but just "par example", please ...) 

Many thanks for any help.

Best regards,

Kamil
On Mon, 28 May 2012 09:28:04 +0200, Nikolay Pokhilchenko <nikolay_po@xxxxxxx> wrote: 


Try to check with ArgyllCMS:

iccgamut -pl Printer.icc
iccgamut -pl ISOCoated.icc
viewgam -cr -t0 -w Printer.gam -cg -t0.5 -s ISOCoated.gam Compare.wrl
You'll get the VRML-visualization file which You can see by VRML-viewer (for example, by Cortona3D Viewer http://www.cortona3d.com/cortona). 


Mon, 28 May 2012 09:11:36 +0200 "Kamil Tresnak":

Actually not exactly. Proofer gamut was bigger than ISOCoated v2
(especially in dark areas where problem mainly is /Process Black with
higher "b" value, for example/, gamuts was displayed in Measure Tool), i
am measuring ECI2002 Random, and compare with Fogra39. I do not suppose
any out of gamut colors here, but maybe i am wrong?

On Mon, 28 May 2012 08:58:19 +0200, Nikolay Pokhilchenko
<nikolay_po@xxxxxxx> wrote:
> Have You checked wither the problematic patches are in printer gamut or > not? Refine procedure can't improve the result with out-of-gamut printer 
> color.
>
> Mon, 28 May 2012 08:51:50 +0200 "Kamil Tresnak" wrote:
>> Hi all,
>> My question is about profile tweaking with refine: what amount of
>> correction is possible to expect? My case: proofer system with Epson
>> Stylus Pro 4800, proofer profile created in Argyll, proof with ISOCoated 
>> v2 as input profile (absolute colrimetric) give us results with few
>> values
>> with deltaE between 6-11. Abstract profile created with refine tool acc 
>> to
>> manual and applied with both colprof and revfix, but i get nearly the
>> same
>> resluts as with original profile in both cases (deltaE differ in
>> tenths).
>> Maybe i am making some systematic error? (Argyll 1.3.5. in this case,
>> but
>> i get similar experience in the past with older version, but dont
>> remeber
>> details).
>> Thank you for any advice,
>> all the best,
>> Kamil
>>
>>


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Attachment: f39_vs_improved-colprof.jpg
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Attachment: f39_vs_improved-revfix.jpg
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Attachment: f39_vs_original_simulation.jpg
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Attachment: original_vs_iprov-colprof.jpg
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