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blend - linearly interporlate two images
blend inimage1 inimage2
outimage param
blend linearly interpolates two images. param
is a floating point number that controls the weighting of the two input
images. A value of 0.0 will use only imimage1, while a value of 1.0 will use
only inimage2. Values outside the range [0.0...1.0] will extrapolate instead
of interpolate between the two images.
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