1. A method for converting image data of an image from a lower bit depth representation to a higher bit depth representation, the image having a saturation region wherein a color model value of each individual pixel in the saturation region is one of: above an upper saturation threshold and below a lower saturation threshold, the method comprising: identifying pixels in the saturation region; and adjusting the color model value of one or more individual pixels in the saturation region by a corresponding adjustment, a magnitude of each adjustment dependent, at least in part, on a number of pixels between the corresponding individual pixel and an edge of the saturation region.