Overlay saturated crosshatch grid onto grayscale image for illusory colours.
type 'cross_colour' into command window and select any .jpg image in the pop up window
-creates saturated version
-creates grayscale image
-loops through a grid and replaces the lines of the gray image with the saturated
-Saturation increase in the code
Random pixel colourization
It is good to consider other patterns and densities of colour that can lead to the effect, here is an example you can run with 'rand_colour', and can change the number and size of the random dots