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Home / Text rendering in Sumatra vs Acrobat
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GitHubRulesOK
White lettering on dark is not your average text and in many cases SumatraPDF can appear better since it does not attempt enhancing the MuPDF Anti-Aliasing any more than the default.
You could try raw MuPDF-GL which can toggle Anti-Aliasing on and off and has some other colour related settings but for reading that White on Grey perhaps stick with Acrobat.