How pages become JPEG files
Each page is drawn onto a canvas at 2x its native size and saved as a JPEG at quality 0.95.
There are no settings on the page: no DPI field, no quality slider, no page range. A typical A4 page (595 by 842 points) comes out at roughly 1190 by 1684 pixels. That is sharp enough for screens and small prints, but not a high-resolution scan of the page.