TPAMFileFormat 

Portable Arbitrary Map is format that can store image data formats of PBM, PGM, and PPM formats with optional alpha channel. 

TPBMFileFormat 

Portable Bit Map is used to store monochrome 1bit images. 

TPFMFileFormat 

Portable Float Map is unofficial extension of PNM format family which can store images with floating point pixels. 

TPGMFileFormat 

Portable Gray Map is used to store grayscale 8bit or 16bit images. 

TPortableMapFileFormat 

Base class for Portable Map file formats (or Portable AnyMaps or PNM). 

TPPMFileFormat 

Portable Pixel Map is used to store RGB images with 8bit or 16bit channels.