Premultiplied (integral) alphas:
- pixel contains (a, ar, ag, ab)
- what Image Composer
- alpha value constrains color magnitude
- alpha modulates image shape
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non-Premultiplied (independent) alphas:
- pixel contains (a, r, g, b)
- what Photoshop does (via layers)
- color values independent of alpha
- what does 100% tranparency mean?
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