On 1/7/2021 10:10 PM, Vedran Miletić wrote:
Hello,
I compared latest ConTeXt standalone (LuaTeX 2.08) against TeX Live 2020 (LuaTeX 1.12). The produced PDFs are:
https://miletic.net/lipsum-112.pdf https://miletic.net/lipsum-208.pdf
Viewing them with Evince (and I assume Adobe Reader, I don't have it at hand to test) shows only minor differences in (horizontal) character spacing, which I would expect; the text looks reasonably good either way. However, viewing them with PDF.js shows a large difference:
https://miletic.net/lipsum-pdfjs-112.png https://miletic.net/lipsum-pdfjs-208.png
As you can observe, b, m, n, p, and r (and possibly others) are moved slightly above other letters. Is this the expected behavior? If not, is this an issue with the way PDF.js is displaying the PDF or the way LuaTeX is producing it? what lua does your 2.08 have? if it's 5.2. then such small differences can be a side effect of lua (different number models), serialization of numbers (default accuracy), or maybe rounding in the lua=>tex font interface (there were some fixes iir), the number of digist that the backend uses, etc
anyhow, so what you see (in the file) is (per line) transform matrices that are slightly different so what you then see is rounding to the device pixels i wouldn't loose sleep over it .. nowadays fonts also evolve and that gives larger differences Hans ----------------------------------------------------------------- Hans Hagen | PRAGMA ADE Ridderstraat 27 | 8061 GH Hasselt | The Netherlands tel: 038 477 53 69 | www.pragma-ade.nl | www.pragma-pod.nl -----------------------------------------------------------------