Where does the 4 come from? I thought it was R+G+B+A, but you already have 3 colour channels in that calculation
Yep, my logic is faulty there. And even if we assume that it's 24bpp color, that's still a factor of 2 out.
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Yep, my logic is faulty there. And even if we assume that it's 24bpp color, that's still a factor of 2 out.