On: Writing to the Framebuffer (2018)

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The format used by the framebuffer can differ based on your hardware and your display settings. You need to use a program that can load raw bitmap data, and it will need you to tell it what format the source data is in (resolution, byte order, etc).

There's a good explanation of this on StackOverflow: https://stackoverflow.com/questions/1645181/taking-a-screen-...