Convert an image to or from ZPL.

Usage: zimage [options] filename [filename [...]]

     filename  Input file name ('-' for stdin).

     Unless specified with the '-o' option, the output filename is derived from the input filename by adding the appropriate extension.

     Options:
        -o (--output)  filename    Output file name ('-' for stdout).
        -f (--format)  format        Output image format (see below).
        -t (--tmpdir)  dir              Directory for temporary files.
        -m (--mono)                    Force a monochrome (1-bit) image.
        -h (--help)                       Print this text.
        -d (--debug)                    Print debugging information to stderr.

     Output image formats:
        bmp     .BMP     Windows Bitmap
        gif        .GIF       Graphics Interchange Format
        jpg       .JPG      Joint Photographics Expert Group
        pcx       .PCX     PC Paintbrush
        png      .PNG     Portable Network Graphics
        pbm     .PBM     Portable Bit Map
        pgm     .PGM     Portable Grey Map
        ppm     .PPM     Portable Pixel Map
        tif        .TIF        Tag Image File Format
        gfp      .ZPL       ZPL ^GF command containing PNG
        gfg      .ZPL       ZPL ^GF command containing GRF
        dyp      .ZPL      ZPL ~DY command containing PNG
        dyg      .ZPL      ZPL ~DY command containing GRF
        dgg     .ZPL      ZPL ~DG command containing GRF
        gf        .ZPL       Synonym for 'gfp'
        dg       .ZPL       Synonym for 'dgg'
        dy       .ZPL       Synonym for 'dyp'
        grf      .ZPL       Synonym for 'dgg'
        zpl      .ZPL       Synonym for 'dyp'