The goal of this small sheet is to rebuild a given image with as few different colors possible.
Let's assume you're the inventor of the kids game 'Malen nach Zahlen', where children can paint your picture template with a certain amount of given colors. Now the question is, on a given picture and a fixed amount of colors allowed, which colors should I pick, to still obtain a good result?
This sheet could answer your question.
Here you can see some results of the program.
Here, you see some comparisons between the original input image on the left and the color-reduced image on the right.
For all instances I used max. 16 colors.
k=3
k=4
k=5
k=7
k=10
k=16
k=25
