Re: [Lcms-user] Apply profile with PCS = cmsSigXYZData, Color Space = cmsSigGrayData

[Aaron B. <bo...@gm...>]

Thanks, Noel. This is not for display on monitor. JPEG 2000 supports
embedded ICC profiles, and I am
trying to use the profile when decoding the image.

On Mon, Feb 20, 2017 at 11:23 AM, Noel Carboni <
NCa...@pr...> wrote:

> Hi Aaron,
>
>
>
> What do you mean by "applies the ICC profile"?  Are you trying to convert
> the image to be displayed accurately on a monitor?
>
>
>
> If so, wouldn't you want the output type to be RGB and use the monitor's
> profile as the output profile?
>
>
>
> Perhaps I'm not understanding at all what you're trying to accomplish.
>
>
>
> -Noel
>
>
>
>
>
> *From:* Aaron Boxer [mailto:bo...@gm...]
> *Sent:* Mon, February 20, 2017 1:04 AM
> *To:* lcm...@li...
> *Subject:* [Lcms-user] Apply profile with PCS = cmsSigXYZData, Color
> Space = cmsSigGrayData
>
>
>
> Hello,
>
>
> I have a jpeg 2000 file with an ICC profile.
>
> PCS is cmsSigXYZData and color space is cmsSigGrayData.
>
> The file can be found here:  https://github.com/GrokImageCompression/grok/
> issues/38
>
> I am working on a library that decodes the jpeg 2000 file and applies the
> ICC profile, using LCMS.
>
> Currently, I have this code:
>
>  in_type = TYPE_GRAY_8;
>  out_type = TYPE_RGB_8;
>  out_prof = cmsCreate_sRGBProfile();
>
> and I can create the transform and apply the ICC profile, but the output
> is an RGB file.
> What I would like is to output a grayscale file.
>
> So, if I instead call
>
> out_prof = cmsCreateGrayProfile(NULL,NULL);
>
> then cmsCreateTransform  returns NULL and I can't apply the profile.
>
> What is the best way of creating a transform for this kind of grayscale
> image ?
>
> Thanks so much,
>
> Aaron
>
>
>
>
>
>
>
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