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Is there a way to use nodes to combine two images if both the images have transparency (i.e. alpha channels)?

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2 Answers 2

up vote 5 down vote accepted

You can use an Alpha over node to automatically handle the alpha mixing:

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However, if all you want to do is mix the alpha channels, a normal mix node will do (think of the alpha channel as a gray scale image):

enter image description here

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There are a few ways to do this. I will show you the way that worked for me. I drew some images in photoshop with alpha. Here is how to combine two images with alpha using the blender compositor. I found that this is the most reliable method to use for external images.

Final Node Setup:

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Final Result:

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