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α-blending two images
The blend() function can be used to create a new image by interpolating two given images (of the same size) using a constant, α. Both images must have the same size and mode. The output image is given by the following:
out = image1 * (1.0 - α) + image2 * α
If α is 0.0, a copy of the first image is returned. If α is 1.0, a copy of the second image is returned. The next code snippet shows an example:
im1 = Image.open("../images/parrot.png")
im2 = Image.open("../images/hill.png")
# 453 340 1280 960 RGB RGBA
im1 = im1.convert('RGBA') # two images have different modes, must be converted to the same mode
im2 = im2.resize((im1.width, im1.height), Image.BILINEAR) # two images have different sizes, must be converted to the same size
im = Image.blend(im1, im2, alpha=0.5).show()
The following figure shows the output image generated by blending the previous two images:
