Hello @biggestloser!
Well, I do not understand what you say because I do not handle the program, however I suppose you say the following:

1- All images in the program are loaded in black and white
2- The codes paint the image adding the grayscale
3- Codes that stabilize the image
4- Codes that add color like red and blue to the image
5- Codes that add the measurement to the image
and all that together is called Histogram.

Every day something is learned, thank you for your article.