When PNG beats JPG for PDF page exports
PNG's lossless compression preserves sharp edges perfectly, which matters for pages with fine text, diagrams, or line art where JPG's compression artifacts would blur detail. It also supports true transparency, useful when you're pulling a logo or figure out of a PDF to drop onto a different background.
The trade-off is file size — PNG exports of photo-heavy pages run larger than the JPG equivalent for the same visual quality, so PNG is the right choice for graphics and text pages, JPG for photographs.