tldr/pages/common/pnmconvol.md

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# pnmconvol
> Convolute a PNM image.
> More information: <https://netpbm.sourceforge.net/doc/pnmconvol.html>.
- 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}}`