Solved by KFrank in post #2 
              
              
                Hi Public! 

Let’s say your images are 256x256 pixels, and each pixel is 
given by an rgb value made up of three 8-bit bytes.  Therefore 
each image is given by 196608 numerical (8-bit) values.  Convert 
these to floats. 
Because your example of color entropy doesn’t care about the 
structure of the…