Easy masking of RGB images

[Adam Hughes]

Hi,

I often find myself wanting to mask two overlay two color images, where the
second image will replace values on the first image rather than adding.  IE:

img1 + img 2 --> adds values
img1 U img2 --> replaces values

Essentially, overlay all the pixels that are not black.

Is there a library or set of functions somewhere that makes this easy?  I
remember a while back thinking I would have to write my own overlay/masking
utilities to get this behavior, but I hope that's not true.

Thanks
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