GIF is one of the most common raster image formats. Its name is an abbreviation for Graphics Interchange Format File. The developer is the CompuServe organization. A feature of this particular image format is its ability to support the animation function. You can edit animated GIFs in different programs (for example, Easy GIF Animator). Animation is achieved due to the fact that a file of this format carries in itself in a certain sequence several raster images at once. With a depth of up to 256 colors, significant data compression in GIF files is possible without loss of quality.
PFM is a font metric data file. It is also one of the formats of the font file category. This applies to fonts in the Adobe Type 1 (= postscript) category used by the Microsoft Windows operating system. The format contains font character sizes. He asks for the font associated file extension .PFB. It does not have the glyphs of the font itself, but with its help, the correct display of the PFB file is obtained. PFM files, that is, the Printer Font Metrics File, contain metric information about the fonts that applications use to lay out lines of text in a document. PostScipt Type 1 fonts have multiple files. The package usually comes with a couple of files with the extensions PFB and PFM. However, there may be 3 files with the extensions AFM, PFB and INF, or all 4 files - PFM, PFB, INF, AFM. Windows 7 and Windows Vista must have PFM. Modern versions of Windows have built-in tools for installing fonts of all formats. The installation procedure is the same for all font formats, but it differs for different versions of Windows. After installation, you may need to restart the application. Only then will the new fonts appear in the font list. You can open the PFM file using programs such as Adobe Photoshop, Adobe Creative Suite, Microsoft Windows Font Viewer, Microsoft Windows.