PHM

File Format
Name	PHM
Ontology	Electronic File Formats Graphics PHM
Extension(s)	.phm
Released	2015

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 'P' 'h' 0x0a.

RGB color PHM files start with bytes 'P' 'H' 0x0a.

Software

• FFmpeg
• libphm

Sample files

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

Links

• Oyranos: Portable Float Map with 16-bit Half