Un-premultiply

非倍增

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Un-premultiply

非倍增

This node is a reversal of the Premultiply Node. If color portions with the unmodified opacity of the Alpha channel were multiplied by the Premultiply Node, the Un-premultiply Node works with the opposite value of the Alpha channel to multiply the color portions. A combination of Premultiply and Un-premultiply will then restore the original color value. The input Alpha channel will also remain unchanged with Un-premultiply.

此节点与预乘节点相反。如果阿尔法通道不透明度未修改的颜色部分乘以预乘节点，则未预乘节点使用与阿尔法通道相反的值来乘以颜色部分。然后使用预叠加和非预叠加组合将恢复原始颜色值。输入阿尔法通道也将保持不变与非预乘。