pnmconvol
Convolute a PNM image.
TLDR
Convolve a PNM image with the specified convolution matrix
$ pnmconvol -matrix=-1,3,-1 [path/to/image.pnm] > [path/to/output.pnm]
Convolve a PNM image with the convolution matrix in the specified files, one for each layer in the input image
$ pnmconvol -matrixfile [path/to/matrix1,path/to/matrix2,...] [path/to/image.pnm] > [path/to/output.pnm]
Convolve a PNM image with the convolution matrix in the specified PNM file
$ pnmconvol [path/to/matrix.pnm] [path/to/image.pnm] > [path/to/output.pnm]
Normalize the weights in the convolution matrix such that they add up to one
$ pnmconvol -matrix=-1,3,-1 -normalize [path/to/image.pnm] > [path/to/output.pnm]
