Epson ES-800C Manuale supplementare - Pagina 10

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300 dpi

600 dpi, using interpolation

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.