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PPM P6 is also what I use all the time - I usually have to convert from paletted format to RGB first.

A PPM paletted format would save me a lot of space.

The built-in support for PPM in Preview on Mac OS X makes it extremely useful.

For my use, alpha is what I tend to miss in PPM. There's the PAM extension [0] but it's not nearly as widely supported as basic PPM. Usually at that point, I reach for PNG via stb_image_write [1].

[0] https://en.wikipedia.org/wiki/Netpbm#PAM_graphics_format

[1] https://github.com/nothings/stb/blob/master/stb_image_write....

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