I am looking at the scratchcard solution and when ‘playing’ with the blocks there is one thing I still do not understand.
Color of the canvas layer above the picture is white (255-255-255) and by scratching you remove this white canvas color layer based on the fourth component of the white color which is set to 0.
I just don’t understand why it doesn’t work with another color e.g. red layer and setting the canvas color to scratch at 255-0-0 should work (analogous to the solution with white) but it doesn’t.
For me this is not logic.Hope you can clarify!