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  • $\begingroup$ Thanks. (I'm on OS X too.) For me, increasing magnification has the same end effect as just printing the plot bigger. (I.e., using the ImageSize option for Plot.) That generates a larger image (and so higher absolute resolution) when I copy and paste it into gmail, but it still looks fuzzy. So I think what I really want to ask is how to increase the DPI? I will edit the question. Thanks for helping me refine. $\endgroup$ Commented Dec 4, 2016 at 15:16
  • $\begingroup$ Actually, I take that back, these aren't quite equivalent. ImageSize is a bit different because it will also affect the relative size of the tick marks and labels. Magnification will only change the absolute size and resolution. Additionally, since gmail will automatically re-size images to the width of the email (which ends up increasing the DPI), magnification essentially solves my problem. $\endgroup$ Commented Dec 4, 2016 at 15:28
  • $\begingroup$ In response to your edit: I sent multiple versions (different magnification settings) to myself within gmail. They all were re-sized to be "full width", but you could clearly see differences in the resolution. And when I downloaded them as raw images and viewed them in Preview, they were different resolutions. This was true for Gmail in both Chrome and Firefox. I then repeated this in OS X Mail. This time, the images were also of different resolutions, but they were much larger across the board, and the DPI looked good. I conclude that this is a problem on Gmail's end, not Mathematica. $\endgroup$ Commented Dec 6, 2016 at 1:39