All versions of Impressario support IRIS RGB image files, RGB and RGBA, color
  and grayscale, compressed and uncompressed.

  Starting with Impressario 1.2, direct printing of JPEG/JFIF, PhotoCD, TIFF
  6.0, GIF 87a and 89a, and FIT images are supported.  In addition both ASCII
  and binary PPM, PGM and PBM images can be directly printed.  Finally,
  Impressario 1.2 adds support for IRIS RGB files with 16 bits per channel, in
  all formats.

  Starting with Impressario 2.1, direct printing of Portable Network Graphics
  (PNG) files is supported (this is part of the ImageVision 3.x software).

  More file formats can be added to Impressario quickly and easily, without
  knowing anything about PostScript or printer device plug-ins.  See the
  Impressario Developer's Guide or the Indigo Magic Integration Guide for more
  details.  Every new file conversion filter is automatically available to all
  printers, so that file conversion filters need only be written once for all
  uses.

Some parts © 2009 Advameg, Inc.