[colord] How do you calibrate projectors with colord and GNOME Color Manager?

[Jeff Fortin Tam]

Hi folks,

Has anyone tried calibrating projectors with colord/g-c-m/etc.?

The gnome color user manual documents how to calibrate a screen, a
camera or scanner, but nothing is said about projectors, including the
setup, distance, whether you must turn off ambient lighting or not, etc.

And as the GNOME color calibration process creates a small square on the
center of the screen (instead of making the whole screen a solid color),
I have a hard time imagining how this can work correctly.

Indeed when I tried with a Colormunki Design spectrometer last time, I
got some very incorrect results (purple-blue color cast). For the sake
of testing then, I tried both with ambient lighting and a pitch-black
room (just the projector).