imgdiff

• This program is an example of using Perl as an improved Bourne Shell

• The Perl here is 100% glue

• The whole thing is basically a wrapper around the pnmarith command

• This performs subtractions of P?M-format images

        run("pnmarith $diff @pnm > $tmp");
        run("xv $tmp");
        run("rm -f $tmp @pnm") unless $LEAVE_TMP_FILES;

• @pnm consts the names of the P?M versions of the original JPEGS:

        sub to_pnm {
          my $fn = shift;
          $fn =~ s/\.jpe?g$//i;
          $fn .= ".ppm";
          $fn;
        }

• This converts foo, foo.jpg, and foo.jpeg to foo.ppm

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Copyright © 2012 M. J. Dominus