Convert rpgm to png

What is the difference between .rpgm and .png?

Description: The RPGM file format, short for Portable Greyscale Map, is a type of image file that specifically stores greyscale graphics or images. It is designed to represent images in various shades of gray, ranging from black to white, without any color information. This file format is typically used in applications or environments where color is not necessary or desired, such as certain types of scientific imaging, document scanning, or specific graphic design projects. RPGM files are part of the Netpbm format collection, which also includes formats for black-and-white and color images.; A PNG file is an image file stored in the Portable Network Graphic (PNG) format. It contains a bitmap of indexed colors and uses lossless compression, similar to a .GIF file but without copyright limitations. PNG files are commonly used to store graphics for web images.