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From Odwiki

Unpremultiplication

If an image is premultiplied (it fades to black where the alpha fades out), you can unpremultiply it by simply dividing the Color component by the Alpha component. Take care not to divide by zero where you can; but these checks are often built into Houdini so you can often be lazy.

See Also

• PreMultiply
• ShaderUnwrap : using unpremultiplication to get rid of seams