The Whitehouse PDF shows a white layer around the birth certificate, not present on the photograph. But as Kevin Vickland has observed, the Xerox printer has an edge erase function which removes a default of 0.12” on all sides.
So I measured the extra information on the Guthrie JPEG and found it to be 12-14 pixels. The total width of the certificate was 497 and the document width was 8.5”. 14/497 = 0.20-24” which would be the width of the erased edges at both sides.
Another myth bites the dust. There is a 0.12” erase edge found on the Embedded JPEG, which matches the expected erase edge.
So let’s double check:
On the Obama JPEG there are 32 pixels of white separating the birth certificate from the right edge. 32 pixels/2252*8.5=0.12” [NBC: Not correct… will have to revise]