
Histogram in Blender was nearly useless - it just didnt work, showed confusing blank results. Two reasons for it: - It was including Alpha in the weighted total value (RGB images have alpha 255 for all pixels) - It was counting the a total weight value max(R, G, B, A), instead of using max(R) and max(G) etc. Now it all draws much nicer - similar to Da Gimp! :)