The HUD color matrix: different implementation for different areas?

As I've tinkered quite extensively with custom HUDs, I thought I could share an intriguing oddity. Let's try the following color matrix transformation code: <MatrixRed> 1, 0, -1 </MatrixRed> <MatrixGreen> -2, 2, 1 </MatrixGreen> <MatrixBlue> 2, 0, 1 </MatrixBlue> According to graphics software channel mixing, the predicted HUD colors will look like this, with the …

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