[Lcms-user] Profing

[<ma...@li...>]

Hi Armindo,

lcms 1.08 does support gamut checking even if no tag is present,
this is new in this revision, and still not checked extensively, but seems
to work well on my profiles. 

Proofing as emulating the target device still needs preview tag, and 
probably will need it on future revisions, since this is a task of the profiler
instead of the CMM.

To enable gamut checking you need to add cmsFLAGS_GAMUTCHECK on flags
when calling cmsCreateProofingTransform(), for target device emulation, add
cmsFLAGS_SOFTPROOFING. Note that those flags only works on 
cmsCreateProofingTransform(), and NOT in normal transforms.

To know if a profile does support softproofing, check the existence of tags:

 icSigPreview0Tag                    = 0x70726530,  /* perceptual */
 icSigPreview1Tag                    = 0x70726531,  /* relative colorimetric */
 icSigPreview2Tag                    = 0x70726532,  /* saturation  */

with 

    cmsIsTag(hProfile, <tag>)

If the tag is present, profile does suport emulation. Printer profiles often has such tags.

> it seems that the 1.08 works fine with delphi.

Great! with this,  I hope to be able (finally!) to release both new packages
on next week. Thanks for the testing.

Best Regards
Marti.

----- Original Message ----- 
From: "Armindo Da Silva" <tec...@wa...>
To: <lcm...@li...>
Sent: Tuesday, November 13, 2001 9:36 AM
Subject: [Lcms-user] Profing


> Hola Marti,
> 
> I would like to do proofing so a few questions :
> 
> how could I know if a specific profile can alow proofing?
> 
> I would like to make a colorpicker that alow me to select only printable
> colors.
> 
> So for this I must know if the printer profile alow proofing.
> 
> Any suggestions for doing this?
> 
> thanks
> 
> Armindo
> 
> 
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