See Microsoft's Image Composer for more info on these images
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Alpha blending simulates the opacity
of cellophane-like layers
General rules:
- Adds one channel per pixel
- 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
- Simulate partial-pixel coverage
- Much ore capable than simple tranparency
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