Monitor profiling (Re: [RFC wayland-protocols] Color management protocol)

[Benoit Gschwind]

On 13/01/2017 15:17, Pekka Paalanen wrote:

> the calibrating or monitor profiling process (are these the same thing?)

As far as I know, no they are different, calibrating a monitor is the 
attempt to set cLUT and monitor setting to be close to a given target, 
often a given color space with a specific white/black point. Profiling 
is the characterization of the monitor (before or after calibration), 
i.e. you build a map from monitor signal to the color that the monitor 
actually show.

Combining both allow applications to correct the signal sent to the 
monitor to get as close as possible the desired physical color.

If I take a concrete example:

The calibration will try to make that (128,128,128) rgb tuple to be 
shown as a gray with half perceptual brightness than the white point, 
using cLUT or monitor settings.

While profiling will send (128,128,128) rgb tuple to the screen an 
measure the the actual color shown as physical luminescence, and store 
it in a file to allow future use for color correction.

Please correct me if I'am wrong.