Is there a good way to work out how well a given ICC file can display
certain colorspace colors using lcms2?

We're imagining a UI where we can put a simple metric like:

    Coverage of sRGB: 95%
    Coverage of AdobeRGB: 82%

For the different ICC profiles the user has installed. ArgyllCMS has
"viewgam -i" which takes quite a long time to process, and I'm
wondering if there's a simpler way to calculate this to a lower
precision using lcms2. If we have to use viewgam we can encode the
value in the ICC dict metadata, but really I'd like to just generate
the value in the UI at display time.

Thanks for any ideas.

Richard.

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