I notice that the quality of the viewer of Texstudio is much better than that of the pdf file it creates. It seems that some quality is lost during the conversion. See below for the comparison. Is there a way to retain the same quality of the viewer in the pdf file? Thanks in advance for any tips.
Pdf:


pdffontsor Adobe Reader/document properties/fonts. These kind of fonts are usually the cause of this kind of quality problem. Some PDF viewers can compensate by anti-aliasing, but this does not solve the cause of the problem. (BTW, TeXstudio just views the PDF file with its integrated PDF viewer.) – Heiko Oberdiek Feb 03 '18 at 09:02