Hilmar Preusse <[email protected]> writes: > Control: forwarded -1 https://tug.org/pipermail/tex-k/2026-May/004330.html
Thanks! As I recall, my pre-filing investigation found that libpng leaves any trailing portion of the row's final byte unspecified. It would of course be possible to tighten that policy up, but there's normally no need to, even from a reproducibility perspective, because such bits are typically of no interest to consumers anyway. As such, it falls on pdfTeX and anything else that takes a similar approach to clear those bits or otherwise populate them consistently. In principal, doing so after reading each row is safest, but observed behavior suggests that clearing them up front should suffice. -- Aaron M. Ucko, KB1CJC (amu at alum.mit.edu, ucko at debian.org) http://www.mit.edu/~amu/ | http://stuff.mit.edu/cgi/finger/[email protected]
