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filters and generator should accept and produce sequences of images. Each sequence has the following format:
width unsigned 4 bytes big-endian
height unsigned 4 bytes big-endian
followed by one or more arrays of pixels:
pixels array of 4 byte big-endian ARGB pixels, width * height in length
pixel_index(x, y) = x + y * width
if a filter does not use alpha in any way it's best practice to copy the input alpha to the output.