Optimizing images for web display?

Does anyone have experience in what settings to use
to create matplotlib images such that they will display
well in a webpage - the ones I have are typically
square, or 3:2 ratio or 2:1 ration (length:height).

What output settings work well so that the images look
good on screen and when printed out (typically to a
hi-res mono laser)?

Thanks!
Derek

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