Create a PCL macro file to program a macro into a HP Laserjet printer
Any image file that ImageMagick's 'convert' program can convert into postscript
can be used.

The resulting macro file should be sent to the printer each time you need to
print the image to ensure that the macro is there since it will be lost
during a power cycle or if another macro with the same ID is sent to the 
printer.

In an Informix 4GL program you would send the macro file to the printer using
the 4GL 'run' command anywhere in the 4GL program before the report prints:

  run "lp -o raw macro.pcl"

Then to print the image you must call the macro in the 4GL report function

  print ascii 27, "&f14Y", # Specify printer macro ID number 14
        ascii 27, "&f4X"   # Overlay last specified macro ID
    
See the PCL reference manual, macros chapter, for help:
  http://h20000.www2.hp.com/bc/docs/support/SupportManual/bpl13210/bpl13210.pdf


Usage: img2mac [options ...] [-o output filename] file

Options
    -i      Macro ID number, range (0 - 32767)
    -v      Vertical position in PCL decipoints     
    -h      Horizontal position in PCL decipoints
    -s      Resize image, value is a percent of original size
    -o      Output filename

EXAMPLE
    img2mac -i 5 -v 6400 -h 3500 -s 75 -o macro.pcl signature.png