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convolve - convolve an input image with a kernel
convolve inimage
outimage kernelimage [-m -d]
convolve convolves the input image
with a kernel image. Kernel images can be created with the program greyscale.
To do a convolution, the kernel image is stepped across the surface of
the input image. At each position, all the image values under the kernel
are multiplied by the corresponding kernel values. The sum of all these
products is divided by the sum of all the values in the kernel. The result
is put into the output image. If the -m option is given, the maximum value
of all the multiplies is put into the output image instead of the normalized
sum of the products. If the -d option is given, a delta value is calculated
wherever the kernel is greater than 128.
blur(6D)
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