See Microsoft's Image Composer for more info on these images
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Alpha blending simulates the opacity
of celluloid layers
General rules:
- Adds one channel to each pixel [a, r, g, b]
- Usually process layers back-to-front (using the over operator)
- 255 or 1.0 indicates an opaque pixel
- 0 indicates a transparent pixel
- Result is a function of foregrond and background pixel colors
- Can simulate partial-pixel coverage for anti-aliasing
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