Fabrizio Levati wrote:
Since 0 0 0 8 corresponds to 100% black channel I simply assumed that all the steps in between must have been equally spaced by 12.5% but that doesn't seem to be the case.
It is affected by the per channel curves. For instance, the per channel curves could compress the range into the clut, and then expand or re-map the resulting clut values. You could try using collink -n, and see if that helps simplify it. Graeme Gill.