But, a person shouldn't necessarily expect to see this kind of textural details clearly in a scan of a document.
But this never slows Birthers down. Take the COLB, the scans showed no clear raised seal. “Ah-ha! Must be a forgery.” cried the Birthers The photos of the COLB clearly showed a seal. So the cry changed to either “Ah-ha! A different forgery.” or “We don't know what document that is.”
Regardless, if the seal was clearly visible in the scans, then Birthers would just smoothly segue on to their next conspiracy theory. Birthers are about emotionally pleasing fantasies, not facts or rational analysis.