Getting printer_draw_bmp to work

I've had success with using the printer functions on Windows. But so far, printer_draw_bmp returns TRUE but outputs nothing visible. Does this function work? My .bmp files are saved with Windows Paint. I've tried monochrome, 16-bit, 256 color, and 24-bit color. I've also tried saving from Photoshop. I'm using PHP 4.3.3. If anyone has gotten this work work, just a confirmation that I'm not spinning my wheels would be good. Or a hint on creating the .bmp file if that is incorrect. The command is so trivial, I wouldn't think I could use multiple fonts yet get this function wrong. Thanks, Paul