xpmtoppm
Convert an X11 pixmap to a PPM image. More information: https://netpbm.sourceforge.net/doc/xpmtoppm.html.
- Convert an XPM image to a PPM image:
xpmtoppm {{path/to/input_file.xpm}} > {{path/to/output_file.ppm}}
- Store the transparency mask of the input image in the specified file:
xpmtoppm --alphaout {{path/to/alpha_file.pbm}} {{path/to/input_file.xpm}} > {{path/to/output_file.ppm}}