Points, not pixels!

In PDFLib documents coordinates are represented in points not pixels. There are 72 points per pixel on a PDF document.

Common paper sizes in points

Paper Size	Width	Height
A0	2380	3368
A1	1684	2380
A2	1190	1684
A3	842	1190
A4	595	842
A5	421	595
A6	297	421
B5	501	709
Letter	612	792
Legal	612	1008
Ledger	1224	792

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More paper sizes: http://home.inter.net/eds/paper/papersize.html