Re: [Lcms-user] Profing

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

Hi,

cmsCreateProofingTransform() can do two  things

- Check gamut to see if a color is reproducible by a device. This always works
- Emulate a device. For example: See how will look a image when printed
  whithout printing. Printer profiles has gamut remapping, and thus, could
  change colors. This works only if adequate tag is present.

By default cmsCreateProofingTransform() does nothing (well, acts 
as a "normal" transform). Then, including one or both flags you add 
the desired function on "Proof" profile. cmsCreateProofingTransform uses
3 profiles, one for input, describing the image,  one for monitor and a 
third for the profile being proofed.

> is there a tag for ABSOLUTE COLORIMETRIC?

No. Is up the CMM to build absolute colorimetric intent using relative
colorimetric or perceptual one. If you have access to icSigPreview1Tag                    
or icSigPreview0Tag, you got absolute colorimetric as well.

Regards,
Marti.


----- Original Message ----- 
From: "Armindo Da Silva" <tec...@wa...>
To: <lcm...@li...>
Sent: Tuesday, November 13, 2001 11:27 AM
Subject: Re: [Lcms-user] Profing


> Marti
> 
> >for target device emulation, add
> > cmsFLAGS_SOFTPROOFING.
> 
> What do you mean by this ?
> 
> 
> > To know if a profile does support softproofing, check the existence of
> tags:
> >
> >  icSigPreview0Tag                    = 0x70726530,  /* perceptual */
> >  icSigPreview1Tag                    = 0x70726531,  /* relative
> colorimetric */
> >  icSigPreview2Tag                    = 0x70726532,  /* saturation  */
> 
> is there a tag for ABSOLUTE COLORIMETRIC?
> 
> thanks
> 
> Armindo
> 
> 
> 
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