PHM
From Just Solve the File Format Problem
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.
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Identification
Grayscale PHM files start with bytes 'P' 'h' 0x0a.
RGB color PHM files start with bytes 'P' 'H' 0x0a.
