Create an index image for a photo CD based on its overview file. More information: https://netpbm.sourceforge.net/doc/pcdovtoppm.html.
pcdovtoppm path/to/file.pcd > path/to/output.ppm
pcdovtoppm -m width -s size path/to/file.pcd > path/to/output.ppm
pcdovtoppm -a n_images -c n_colours path/to/file.pcd > path/to/output.ppm
pcdovtoppm -f font -w path/to/file.pcd > path/to/output.ppm