Grayscale phm filter

Download and install the latest version of Filestar.
Right click on one or more Phm file(s) on your desktop and select Convert with Filestar.
Type grayscale filter in the search box.
Press Run.

What is .phm?

Name: Portable Half Float Map
Extension: .phm
Format: Binary
Category: Raster Image
Developer: Laslo Hunhold
Description: An FF file is an image saved in the farbfeld image format. It contains an uncompressed image that can be compressed using a variety of image compression formats.
MIME Type: image/x-farbfeld
Sample: sample.phm

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Last updated October 3, 2026