Hand decoding the vcgt I get the following:
http://people.freedesktop.org/~hughsient/temp/Screenshot-Color%20Management.png
Using LCMS-2 I get the following:
http://people.freedesktop.org/~hughsient/temp/Screenshot-Color%20Management-1.png

Note: this only happens using the adobegamma profile, the others work
perfectly. The profile is available here:
http://github.com/hughsie/shared-color-profiles/raw/master/profiles/AdobeGammaTest.icm

I suspect it's something to do with the adobe quirk as documented in
xcalib, and viewable here:
http://git.gnome.org/browse/gnome-color-manager/tree/src/gcm-profile-lcms1.c?id=GNOME_COLOR_MANAGER_2_30_2#n235

Richard.

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