Anders Torger wrote:
However, a source of confusion may be that I have misunderstood where the data is. I thought that for an .icc profile from dispcal vgct = calibration curves and rTRC/gTRC/bTRC = profile (*after* vcgt applied)...
Not quite right. Yes calibration curves are typically stored in the vcgt tag (but changes to the display controls are also calibration, and their settings are not stored anywhere other than the display itself!), but the profile consists of (matrix:) rTRC/gTRC/bTRC + matrix or (cLUT:) per-channel-curves + lookup table + per-channel-curves, and in a color managed workflow (something like) the inverse of the profile is applied to the color to be displayed _before_ the calibration (vcgt) curves. Since the vcgt curves are loaded into the hardware (graphics card), they are the last thing that changes the device values on the way out. Graeme Gill.
