cmsReadChromaticAdaptationMatrix request

Hi,

I agree having to impose such limitations is lame, but there
are
Legal implications that is just better to avoid. Really. 
Anyway, I think You can effectively ignore the chromatic 
adaptation tag since the Information it contains is only 
used by a specialized kind of absolute colorimetric intent. 
Very few CMM honor this tag, which main purpose is to 
recover the chromaticity of original illuminant. Also this 
is v4 stuff: that means any v2 CMM should ignore this tag. 
This is certainly the case of ICM. 

I haven't tried, but chances are that ICM and 
Get/SetColorProfileElement will not handle the tag.

Regards
Marti Maria
The littleCMS project
www.littlecms.com

 

On 23/12/2006 17:05:53, Sergey Tolstov (stolstovesri.com)
wrote:
> Hi Marti,
> 
> Thank you for your answer.
> I thought to create a temporary copy of matrix RGB
profile parameters
> which has only gamma-table modified.
> I would copy all profile properties but gamma table.
The later is made
> to be linear function.
> This profile is to be used as a rendering color space.
Input colors then
> to be converted to the rendering color space before
rendering.
> After rendering is complete, conversion to the original
profile happens.
> The icSigChromaticAdaptationTag is one of the
parameters which are
> necessary to be copied.
> 
> However, now I suppose it could indeed bring copyright
issues indeed.
> 
> By the way. Take a look into the ICM on MSDN. It
provides the following
> functions:
> GetColorProfileElementTag
> GetColorProfileElement
> SetColorProfileElement
> GetColorProfileHeader
> SetColorProfileHeader
> I never used them, but it seems to me they do exactly
what you are
> trying the littleCMS to prevent to do
> 
> Thanks,
> Sergey
> 
> > -----Original Message-----
> > From: Marti Maria [mailto:marti.marialittlecms.com]
> > Sent: Saturday, December 23, 2006 6:53 AM
> > To: Sergey Tolstov
> > Subject: Re: [Lcms-user]
cmsReadChromaticAdaptationMatrix request
> 


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