How can I reverse black and white in a grayscale image?
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I have a grayscale image and I'm trying to reverse the black and white in it as an exercise. I think I'm supposed to use for loops in some way to access the colormap so the entire image matrix is composed of 1's and 0's (at which point I could switch the two by subtracting 1 from all values) but I don't know how to get this matrix in the first place. Thank you!