Syntax: PIL.Image.blend(image1, image2, alpha).
image1: first image
image2: second image, must have the same mode and size as the first image.
alpha: The interpolation alpha factor. If alpha is 0.0, a copy of the first image is returned. If alpha is 1.0, a copy of the second image is returned. There are no restrictions on the alpha value. If necessary, the result is clipped to fit into the allowed output range.
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