Bob Friesenhahn wrote:

You need to learn about how to do this other than via this private discussion.  
It seems to be handled by storing a JPEG chunk with the computed ID JPEG_APP0+2.

Yes, this falls under the category which I call "color management system".
This is an extensive topic and it will need some time to study
before you get a sufficient understanding of the subject.
In any case it exceeds by far the responsibilities of a core image codec.

Suffice it to say that Photoshop and other software which cares (e.g. ImageMagick 
& GraphicsMagick) has been doing this stuff for many years.

Yes, but they didn't care to provide a SIMPLE mechanism for
storing wide gamut colors for common image interchange.
IJG now closes this gap, that is our distinguished responsibility.

Regards
Guido


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