picttoppm
Convert a Macintosh PICT file to a PPM image.
TLDR
Convert a PICT file to a PPM image
$ picttoppm [path/to/file.pict] > [path/to/file.ppm]
Force any images in the PICT file to be output at full resolution
$ picttoppm -fullres [path/to/file.pict] > [path/to/file.ppm]
Do not assume that the input file contains a PICT header and execute quickdraw operations only
$ picttoppm -noheader -quickdraw [path/to/file.pict] > [path/to/file.ppm]