chaiNNer
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TIFF Destructive Premultiplied Alpha
Loading a TIFF image with alpha and then piping it directly into a Preview Image node will result in a different, darker image. This effect carries over when saving the image to disk as well. This seems to be chaiNNer treating .tiff files as though they always have associative alpha.
Doing the same with the same image saved as a .png with alpha does not have the same effect.