PHM

PHM is a raster image format. It is an extension of the Netpbm formats, especially PFM. Each color sample is a 16-bit floating-point number.

Its full name is variously given as "Portable Float Map with 16-bit Half", "Simple Portable Half Float Map", "Portable HalfFloatMap", etc.

Identification
Grayscale PHM files start with bytes.

RGB color PHM files start with bytes.

Software

 * FFmpeg
 * libphm

Sample files

 * https://github.com/syoyo/libphm/blob/main/asakusa.phm

Links

 * Oyranos: Portable Float Map with 16-bit Half