unique colors v2

Extracted the unique colors of 8 images 1024*1024 (1,048,576 pixels)

v1 : In order of appearance in each image
v2 : In order of ranking ascending numerical [R,G,B] 0,0,0 -> 255,255,255



Not quite a first attempt, since I had already explored this concept and approach in this entry : allrgb.com/without-software-beta