Did you try to create a standard profile?:
cmsCreateLabProfile(cmsD50_xyY());
ColorConverter seems not to be a lcms API. Sorry I can not follow much
with it.
Usually a transform is created from one colour space to an other, like
RGB to CMYK or Gray to Lab.
An example how this works can be found in the tifficc command line util,
which is provided with the lcms library. You can look at the sources.
regards
Kai-Uwe Behrmann
+ development for color management
+ imaging / panoramas
+ email: [EMAIL PROTECTED]
+ http://www.behrmann.name
Am 26.04.05, 16:29 -0400 schrieb Leonard Rosenthol:
> I'm trying to get lcms to properly construct a Lab profile to match the data
> for a Lab colorspace that is described in a PDF.
>
> Logic tells me that it should just be:
>
> * Load the XYZ values from the Lab colorspace data
> * Convert XYZ to xyY
> * CreateLabProfile
> * Create transforms between that and the output profile, with TYPE_Lab_8 data
>
> and then send the data into the transform...
>
> What am I missing?!?!?
>
> Leonard
> P.S. Here is the actual code snippet to back up what I wrote above.
>
>
> {
> CMSErrorHandler myErrorHandler;
>
> // create the profile based conversions
> cmsCIEXYZ labXYZ;
> cmsCIExyY labWhitePoint;
> labXYZ.X = ASFixedToDouble( whiteX );
> labXYZ.Y = ASFixedToDouble( whiteY );
> labXYZ.Z = ASFixedToDouble( whiteZ );
> cmsXYZ2xyY( &labWhitePoint, &labXYZ );
>
> mlabProfile = cmsCreateLabProfile( &labWhitePoint );
> mGrayConverter = new ColorConverter( mLog, mlabProfile,
> grayProfile, TYPE_Lab_8, TYPE_GRAY_8 );
> mRGBConverter = new ColorConverter( mLog, mlabProfile, rgbProfile,
> TYPE_Lab_8, TYPE_RGB_8,
> inConverter.GetCurrentRGBIntent()
> );
> mCMYKConverter = new ColorConverter( mLog, mlabProfile, cmykProfile,
> TYPE_Lab_8, TYPE_CMYK_8,
> inConverter.GetCurrentCMYKIntent() );
> }
>
> ---------------------------------------------------------------------------
> Leonard Rosenthol <mailto:[EMAIL PROTECTED]>
> Chief Technical Officer <http://www.pdfsages.com>
> PDF Sages, Inc. 215-938-7080 (voice)
> 215-938-0880 (fax)
>
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