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
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