Top image
shows the same check that has been warmed beyond room temperature
to verify the hidden word VALID in both the PAY and SIGNATURE area
of interest. Below this is a split scanned image of the original
document and then what that exact document
will do
under
typical
scanning
conditions
at
the
bank for IRD conversion. The scan below it shows an extreme magnification
of the "P" to show the microstructures used to create
a specific pixel/paxel pattern once compressed.
