.PNM - Portable image format
.PBM - Portable bitimage format
.PGM - Portable grayimage format
.PPM - Portable pixelmap format

Features:

• Pixel formats: 1, 8, 24 bits/pixel.
  
  
• Compression: Uncompressed binary or Ascii text format.
  
  
• Defined by: PBMPLUS.
  
  

Supported by:

• Image Eye (read only).
• Any Image (read only).