What is a PPM file?
The Portable Pixmap (PPM) format stores 24-bit color images. The files are in text format, and each pixel gets a number between 0 and 65536. It is an uncompressed format which means the size of the final output is generally larger than some of its peers, making it less popular amongst the users.
Along with that, it also stores the height and width, maximum color value, and whitespace data of the image.
How to Open PPM Files
How to Make PPM Files
Exact steps for creating PPM files will vary by program and operating system. Download one of the above listed programs and you should be able to follow typical procedure for opening files or creating files from the File menu. Typically you will select File > Open or File > New and continue through the prompts. Some programs may follow a different procedure for either creation or opening of files.