PFS (Portable Floatmap Stream)
PFS is a raster image file format associated with the pfstools software. It supports high dynamic range images. It is an uncompressed format, primarily intended for temporary files and datastreams.
It was originally going to be named PFM (Portable FloatMap), but was named PFS (Portable Floatmap Stream) instead, due to a conflict.
The .pfs filename extension seems logical, but we haven't found any evidence of its use.
Files begin with bytes
'P' 'F' 'S' '1' 0x0A.