New operation to normalize for non-uniform illumination

An example is given under image processing for ImageRemoveBackground for multiplicative background. This is common enough that I would ask for a new operator akin to ImageRemoveTransFunction. It would encompass all of the operations presented to normalize an image for the transmission function (non-uniform illumination). One additional flag might be /M (mode) = 0 (pin transformed image at min intensity, normalize up), 1 (pin transformed image at max, normalize down).