Blender Compositing and Post Processing by Mythravarun Vepakomma

Author:Mythravarun Vepakomma
Language: eng
Format: epub
Publisher: Packt Publishing

Use Alpha

The Use Alpha button of the Mix node instructs the Mix node to use the Alpha channel available in the foreground image. Based on the grayscale information in the alpha channel, the foreground pixels are made transparent to view the background image. The effect of the selected blending mode is thus seen only in the nontransparent foreground pixels. The Alpha channel of the output image is not affected by this option.

Factor

The factor input field (Fac) decides the amount of mixing of the bottom socket. A factor of 0.0 does not use the bottom socket, whereas a value of 1.0 makes full use. In Mix mode, 50:50 (0.50) is an even mix between the two, but in Add mode, 0.50 means that only half of the second socket's influence will be applied.

The following screenshot shows outputs from all the described Mix modes without altering the inputs connected to the top and bottom nodes:

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