The proofing intent works as intented using media whitepoint for
absolute colorimetric intent, other than I wrote in my previous mail.
Lcms seems to behave correctly in this regard.
Sorry for any confusion to others, caused by me.
regards
Kai-Uwe Behrmann
+ development for color management
+ imaging / panoramas
+ email: [EMAIL PROTECTED]
+ http://www.behrmann.name
Am 28.01.06, 12:32 +0100 schrieb Kai-Uwe Behrmann:
> Alain,
>
> currently lcms does proofing without being influenced by the whitepoint in
> the proofing profile. lcms seems allways to expect
> INTENT_RELATIVE_COLORIMETRIC and dont triggers if get tould tould to use
> INTENT_ABSOLUTE_COLORIMETRIC as proofing rendering intent.
> The INTENT_ABSOLUTE_COLORIMETRIC as proofing intent should consider the
> media whitepoint of the proofing profile. But it does not - at lest not in
> my tests.
> The effect would be similiar to switching on the paperwhite and black
> simulation in photoshop. One can easily reach the same by doing all involved
> transformations by hand. It looks identical (allmost) to photoshop
> results.
>
> About using black simulation only:
> This is not a must in my opinion. But as many things in colourmanagement
> it is a question of taste due to complexity of decissions.
> My impression here is: to not dull the view further, by using black
> simulation only, gives some older screens advantage over bright standard
> D50 illuminations. Modern LCD's are bright enough to minimise the
> difference between soft-and hardproof under D50 normlighting conditions.
>
> paper white simulation:
> Paperwhite simulation is available only together with black simulation in
> PS. This would be nice to have in lcms in one step - using the proofing
> profiles media whitepoint with proofing intent
> INTENT_ABSOLUTE_COLORIMETRIC as described above.
>
>
> Anyway the results for printing are impressive. Many thanks to Marti.
>
> kind regards
> Kai-Uwe Behrmann
> + development for color management
> + imaging / panoramas
> + email: [EMAIL PROTECTED]
> + http://www.behrmann.name
>
>
>
> Am 27.01.06, 23:39 +0100 schrieb Alain:
>
> > Hi
> >
> > I'm quite impressed with lcms and have been doing some tests with it.
> >
> > I've got a question about the difference in softproofing between lcms
> > and photoshop.
> >
> > I've found a thread from may 2004 about it, with following conclusion:
> >
> >
> > "The softproofing done by lcms is same as you were using "black ink"
> > only in Photoshop."
> > and
> > "Photoshop does weird things on softproof. I don"t doubt the
> > usefulness of Photoshop "emulate white paper", "discount ink
> > black" and so, but I didn"t implement all that. Just because, well,
> > these are Photoshop features, not described in ICC spec."
> >
> >
> > Is this still the current status? (or) is there a "bypas" to get
> > closer to "the photoshop way without black ink", although this is less
> > correct?
> >
> >
> > Alain
> >
>
>
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Mit freundlichen Grüßen
Kai-Uwe Behrmann
+ Programmierung für
+ Farbmanagement / Bilder / Panoramen
+ http://www.behrmann.name
+ email: [EMAIL PROTECTED]
