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Unpremultiply effect

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Use this effect to convert an image from premultiplied alpha to unpremultiplied alpha. The effect replaces each input pixel P = {R, G, B, A} with P' = {R/A, G/A, B/A, A} in the output.

This effect has no properties.

The CLSID for this effect is CLSID_D2D1Unpremultiply.

Output bitmap

The output bitmap size is the same as the input bitmap size.

Requirements

Requirement Value
Minimum supported client Windows 8 and Platform Update for Windows 7 [desktop apps | Windows Store apps]
Minimum supported server Windows 8 and Platform Update for Windows 7 [desktop apps | Windows Store apps]
Header d2d1effects.h
Library d2d1.lib, dxguid.lib

 

ID2D1Effect