I wanted someone to help interpret my results as I don't really understand them. I created an LUT table that is applied to the Hue vales of a matrix. It works fine, isolates the desired range of colors. Now, if I fill the table with the range of color (100 - 120) and the rest of the table with 255 instead of 0, the image is then inverted. It goes from a light object in black background to a black object in white background once the other non-range values are changed from 0 to 255. It's a desirable result but I don't understand it because the cvLUT function states that it will index pixels only in the range. So why does a hue value of 255 cause inversion? Not to mention that the Hue value is multiplied by 2 with reconstruction of the image (Hue is divided by 2 to fit into an 8bit number.