Interesting. Can I select the type of interpolation? I don't see an option
for that in the man page.
On Mon, Jul 22, 2013 at 12:25 PM, Marti Maria <marti.ma...@littlecms.com>wrote:
>
> > I'm trying to match Adobe's color conversions for a UI we are building.
>
> Why not ColorSync, or the SampleICC reference implementation? These have
> small differences with ACE as well...
>
>
> > Are all CMS theoretically suppose to output the same results when the
> same input and output ICC profiles are being used?
>
> Theoretically yes. In practical, all have small differences in some
> values. The color you are talking about is on gamut boundary of sRGB and
> probably out of SWOP gamut (see the 100% of Yellow). Maybe ACE is using
> some special algorithm for those colors. The interpolation may also make a
> difference on boundaries (trilinear vs. tetrahedric)
>
> Regards
> Marti
>
>
>
>
> El 22/07/2013 20:17, Alexander W. Rolek escribió:
>
> I agree visually the impact is minimal. I'm trying to match Adobe's color
> conversions for a UI we are building. I think it might have to do with
> Adobe's (ACE) engine being used. Are all CMS theoretically suppose to
> output the same results when the same input and output ICC profiles are
> being used?
>
>
> On Mon, Jul 22, 2013 at 8:58 AM, <marti.ma...@littlecms.com> wrote:
>
>>
>> Hi,
>>
>> I really don't know about those differences. I've checked lcms2 against
>> Graeme Gill's argyll and also against SampleICC, all we agree on same
>> value, but Adobe slighly differ. I wonder what kind of secret sauce
>> they are using. Visually, the impact is minimal.
>>
>> Regards
>> Marti
>>
>>
>>
>>
>> Quoting "Alexander W. Rolek" <a.ro...@gmail.com>:
>>
>> I have been trying to match the color conversions of Adobe Illustrator's
>>> color picker using the transicc tool, but I just can't seem to get them
>>> perfect. I found the .icc profiles that Adobe is using, and matched the
>>> settings under Illustrator's Color Settings. I have been using the
>>> following command:
>>>
>>> echo 224 62 0 | transicc -i RGB\ Profiles/sRGB\ Color\ Space\ Profile.icm
>>> -o CMYK\ Profiles/USWebCoatedSWOP.icc -t 1 -b -n
>>>
>>> My output is:
>>>
>>> LittleCMS ColorSpace conversion calculator - 4.2 [LittleCMS 2.05]
>>> 5.9434 90.2419 100.0000 0.8774
>>>
>>> Adobe Illustrator displays the CMYK as: 7% 90% 100% 1%
>>>
>>> It's very close, with Cyan being the farthest off. What setting am I
>>> missing in order to achieve perfection?
>>>
>>> --
>>> Alexander W. Rolek
>>>
>>>
>>
>>
>>
>
>
> --
> Alexander W. Rolek
> 303-829-9989
>
>
>
--
Alexander W. Rolek
303-829-9989
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