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300 dpi
600 dpi, using interpolation
W
I
HAT IS
NTERPOLATION
Each flatbed scanner has a maximum optical
resolution based on the physical number of light
sensors in the bed. For example, a 400 dpi scanner
has 400 sensors per horizontal inch. Despite
this maximum value, many scanners can use a
process called interpolation to achieve higher
resolutions. Interpolation allows the software to
make an educated guess based on mathematical
probability to determine the value of pixels it can't
see and then insert these values in the final image.
Interpolation can be especially useful to improve
the jagged appearance in some line drawings, as
shown in the samples on the left.
Epson scanners use interpolation to double
the scanner's native resolution, so our 300 dpi
scanners achieve apparent resolutions of up to 600
dpi, and our 400 dpi scanners attain resolutions of
up to 800 dpi. By using the enlargement feature,
which goes up to 200% on most programs, you
can even "stretch" the apparent resolution on a
400 dpi scanner to 1600 dpi.
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