This tutorial outlines how to enhance illustrations for larger screens, indicating the need for updated photo formats.
Matt just commented to me: "One thing I am realizing is that I have loads(*) of cleaned-up, ready-to-post photos in old talks, that I've never posted." I too have that experience. The problem is, they tend to be sized for a 1280×960 projector screen, which is not really good enough for modern illustrations.
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Mike Taylor (2017) studied this question.
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