1. An imaging device, comprising: an optical sensing unit that generates image data having a plurality of pixels, each pixel having a plurality of color channels, each color channel having a color value; and an image processing unit, comprising: a radial falloff unit that applies falloff gains to the respective color values of the plurality of color channels associated with a pixel; a clamp threshold unit that generates a clamp threshold based on a minimum value of a set of values for the color values of the pixel, the color values of the pixel being based on total gains applied to the respective color values for the pixel, each total gain based on the falloff gain applied to the respective color value for the pixel; and a clamping unit that limits the color values for the pixel to the clamp threshold.