Masking is a digital image processing term simialar in concept to bitmasking. An image mask is applyed pixel-by-pixel to other image and behaves like a sieve to color values.

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Best way to mask 2D sprites in XNA?

I currently am trying to mask some sprites. Rather than explaining it in words, I've made up some example pictures: The area to mask (in white) Now, the red sprite that needs to be cropped. The ...