Category: Processing > Color Channels
Extracts the alpha channel from a color input. If the input has no Alpha channel, the shader converts the input color to an RGBA grayscale. The returned R, G, B, and A channels will all have the same value.
Tips: Use this converter whenever you need to extract the alpha channel. For example, if you blend a surface with a transparency ramp, you can adjust the intensity of the ramp by adjusting the factor. This factor can also be animated. Values less than 1 turn black area into gray, and values over 1 change the gray to black
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