From Just Solve the File Format Problem
PSF is a proprietary raster image file format associated with the ArcSoft PhotoStudio photo editing software as well as ArcSoft PhotoImpression software. A version of PhotoStudio/Impression was included with some Canon digital cameras.
PSF begin with the hex values
46 53 50 41 or
FSPA in ASCII. The files also appear to have JPEG data encoded within the file after the proprietary header.
- Sample PSF file
- PhotoImpression Disc with PSF samples
- PhotoStudio FAQ → "What is a PSF file?"
- Trid PSF definition