Dear Chris, I may not be understanding what you are asking, but it seems to me that what ENVI naturally does when it displays an image is show brightnesses based on the pixel values in the wavelength band for that image. Which I think sounds like the same thing as adjusting contrast based on spectral bands. Is that what you are looking for? So, the brightness of a pixel corresponds to the intensity of the return (reflectance, or whatever) for that pixel. If you are looking for something different, perhaps it might help if you tried explaining it in a different way? - Peg