pnmtorle
Convert a PNM file to an Utah Raster Tools RLE image file.
TLDR
Convert a PNM image to an RLE image
$ pnmtorle [path/to/input.pnm] > [path/to/output.rle]
Print PNM header information to stdout
$ pnmtorle -verbose [path/to/input.pnm] > [path/to/output.rle]
Include a transparency channel in the output image in which every black pixel is set to fully transparent and every other pixel is set to fully opaque
$ pnmtorle -alpha [path/to/input.pnm] > [path/to/output.rle]
