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Re:AVIF – AV1 based image format by cbhl on Tuesday April 10, 2018 @05:17PM (#16805529)
AV1 (and thus AVIF) appears to be designed for screens (works in YUV color space).

If you want to print, PDF is probably still your best bet.

Re:AVIF – AV1 based image format by paulkerr on Tuesday April 10, 2018 @11:36PM (#16807836)
AV1 can also encode RGB color space. Such usage would probably be more prevalent in the still image use case.
Re:AVIF – AV1 based image format by ComputerGuru on Tuesday April 10, 2018 @10:59PM (#16807696)
Actually I munged two issues. CMYK is for print but DPI is for retina images.