Any hint for not_art

Type your comment> @AzAxIaL said:

@deleite said:
Using the RGB values you only get 3 different values, this is similar to a base. From there Check the min and max values you can get converting from that base to decimal. Once you see that number you’ll understand next step.

This was the biggest hint to solve it. My advice for the final part is think about the shape of the image.
PM me if you need help.

Got it! Thanks a lot for the hints!