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Originally Posted by alex_d
p.s. the page-size (screen-size) parameter in a pdf is pretty much irrelevant. What matters is aspect ratio. 3:4 is the AR of the screen. Counting the status bar, however, the pdf AR is probably a bit wider (3.2:4 perhaps). To check for sure, create totally black PDF pages and see how they render. The size of the page is meaningless since pdf is a vector format, not an image with pixels. If you double the page size, you can double the font size and it'll look identical.
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Yes, everything in a PDF is stored as scalable vectors, and the reader scales the PDF to fill the display. So if I make a PDF w/ a 12pt font I can make it look larger or smaller by decreasing or increasing the page size while retaining the same aspect-ratio. But the "PostScript point" is a measurement of length (= ~0.35mm) -- what if I want 1pt in my document to correspond to 1pt on the Reader screen? For that we need to know the exact dimensions of the usable area.
Your idea about using a black page to find aspect ratio is a good one -- I'd used a page-edge border to figure out one which looked right before, but not very scientifically. Now that we know 1px is 121x123 microns, I'm going to try to throw together some PDFs we can use to figure out the exact visible dimensions.