As some users asked for this, I am recovering an old test I posted in lcms blog many years ago. Basically, it uses special images with crafted embedded profiles. If profiles are correctly honored, a text will show up. But not all web browsers behave equally.
Here are the old tests. They only check V2 compatibility.
No surprises. The images are using embedded profiles to do the trick. A self-explanatory text shows up on each image.
Days ago, a very interesting question arose in the mailing list.
How can I visualiza the gamut of a profile?
Little CMS does not offer direct tools to do that. But with some code, it is easy to do so. Be warned there is some hacking required.
A typical profile can be thought as a “black box” that translates values from a colorimetric space, usually CIE L*a*b*, to a device space. For example, RGB in a screen profile. Since the range of realizable colors (the gamut) is limited on real devices, not all Lab values would have a corresponding RGB. Only the Lab values that are inside monitor gamut would be displayed.
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