pgmkernel
Generate a convolution kernel to be used with `pnmconvol`.
TLDR
Generate a convolution kernel
$ pgmkernel [width] [height] > [path/to/output.pgm]
Generate a quadratic convolution kernel
$ pgmkernel [size] > [path/to/output.pgm]
Specify the weight of the center in the generated kernel
$ pgmkernel -weight [value] [width] [height] > [path/to/output.pgm]
