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Load image into alpha channel?

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Hi, I have two 24-bit images with the same dimensions. The second one represents the alpha channel of the first one. How can I load the second image (one of the RGB channels or maybe greyscale) into the alpha channel of the first image?

I tried it with 2 layers and "multiply", but that just multiplies the RGB values together. Is it possible to copy channels into another, so that I could copy the R channel into the alpha channel of the second image and then use "multiply" with 2 layers?



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