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I just this on Twitter. I haven't tried it, so I can speak for its ability to do what you want. In Terminal, simply issue:
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<div class="">defaults -currentHost write -g AppleFontSmoothing -int 0</div>
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<div class="">Then restart your Mac.</div>
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<div class="">Gary</div>
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<div class="">On Nov 13, 2020, at 6:54 PM, Richard Seguin <<a href="mailto:riseguin@earthlink.net" class="">riseguin@earthlink.net</a>> wrote:</div>
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Gary,
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<div class="">I guess you would need a sub-4k display in order to answer my question. Thanks anyway.</div>
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<div class="">Richard</div>
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<div class="">On Nov 13, 2020, at 3:43 PM, Gray, Gary L <<a href="mailto:euler@psu.edu" class="">euler@psu.edu</a>> wrote:</div>
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I have a MacBook Pro that drives a 27" 4k display and a 27" 5k display. Fonts look good to me on all three. Actually, they look GREAT on the MBP and 5k display, but that is another story.
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<div class="">What should I be looking for?</div>
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<div class="">Gary<br class="">
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<div class="">On Nov 13, 2020, at 4:30 PM, Richard Seguin <<a href="mailto:riseguin@earthlink.net" class="">riseguin@earthlink.net</a>> wrote:</div>
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<div class=""><span style="caret-color: rgb(0, 0, 0); font-family: MesloLGM-Regular; font-size: 14px; font-style: normal; font-variant-caps: normal; font-weight: normal; letter-spacing: normal; text-align: start; text-indent: 0px; text-transform: none; white-space: normal; word-spacing: 0px; -webkit-text-stroke-width: 0px; text-decoration: none; float: none; display: inline !important;" class="">One
 of my disappointments with several versions of macOS through Mojave was the poor font rendering from PDFKit (i.e., TeXShop and Skim) on sub-Retina monitors. I cringed when I updated straight from 10.14.6 to 10.15.6 thinking that it could get even worse, but
 was shocked when I discovered that Apple seemed to have finally (after several years) restored effective font smoothing in PDFKit in Mojave. Since Apple often seems to move in mysterious ways, I have to ask if anyone knows if the effective font smoothing is
 still there in Big Sur or if they’ve taken it away again.</span><br style="caret-color: rgb(0, 0, 0); font-family: MesloLGM-Regular; font-size: 14px; font-style: normal; font-variant-caps: normal; font-weight: normal; letter-spacing: normal; text-align: start; text-indent: 0px; text-transform: none; white-space: normal; word-spacing: 0px; -webkit-text-stroke-width: 0px; text-decoration: none;" class="">
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