Barry Watzman wrote: Agreed. I disagree with the "all scanned PDF files are jpegs", including this one. Barry, there may be places here and there in the manual where things aren't bi-level, but everything I have looked at is bilevel, including that image. Zoom in and you'll see the characteristic stair-step on the edges of characters. Acrobat has smarts where even if you scan grayscale, it will classify bilevel stuff and use G3/G4/JBIG (as per settings) or it will use a deeper image format with none/jpeg/jpeg2000 (as per settings). Zoom in at 2400% settings and see for yourself. Or taking another approach -- this document has 61 pages, and the page were 8.5" x 11" probably. The document is also 451 KB, or 7.4 KB/page, much less than the 3.3 KB/in^2 that you recommend for jpeg. Even if you disagree with my claims above, *something* is making this doc much smaller than what you'd expect from jpeg encoding. Another thing that can be confusing is that even when an image is bilevel, acrobat will convert to grayscale on display up to some zoom level. If you aren't zoomed in enough, things look like they have grayscale edges, but zoom in enough and you'll see it was reconstructing the graylevels by doing some filtering.