PFM (Portable Float Map)

Overview
PFM (Portable FloatMap) is the unofficial floating point Netpbm image format.

Such a format has been invented multiple times, in incompatible ways. The most standard version of it is probably the one supported by Netpbm.

Identification
Files begin with ASCII characters " " or " ".

Software

 * Netpbm
 * ImageMagick

Resources

 * Netpbm: PFM graphic image file format
 * PFM Portable FloatMap Image Format