Convert pgm to fpx

What is the difference between .pgm and .fpx?

Description: A PGM file is a grayscale image file saved in the portable gray map (PGM) format and encoded with one or two bytes (8 or 16 bits) per pixel. It contains header information and a grid of numbers that represent different shades of gray from black (0) to white (up to 65,536). PGM files are typically stored in ASCII text format, but also have a binary representation.; The FPX (FlashPix Bitmap Image File) format is a type of image file designed to support high-resolution photographs and images. Developed in the mid-1990s by a consortium including Kodak, Microsoft, Hewlett-Packard, and Live Picture Inc., the FPX format is based on the Image Content Architecture (ICA), which allows it to store multiple resolutions of an image within a single file. This makes it especially useful for efficiently viewing and editing images without requiring the full image file.