Hello, I figured this topic was already raised before, like in https://lists.gnu.org/archive/html/auctex/2016-05/msg00030.html (starting from https://auctex.gnu.narkive.com/VIELjyjv/embedded-previews-in-high-dpi)
I was running Debian/Emacs/AUCTeX on my MacBookPro with "Retina display" with no problem at all once I set the right DPI for X Window. But I recently had to switch to MacOS and that blurry preview problem became quite an annoyance that I finally decided to do something about it so I started to fiddle with various configurations for days to no avail. It seems the issue has been around for a while so I was wondering whether the fix is available or not as of now. I'm using Emacs 26.1 obtained from homebrew (brew cask install emacs), AUCTeX 12.1.1, MacTeX-2018, MacOS Mojave and MacBookPro with 15 inch retina display. Thank you!
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