Epson 1640SU - Perfection Photo Scanner Handbuch - Seite 4

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Epson 1640SU - Perfection Photo Scanner Handbuch
Image Quality—Epson ColorTrue® Imaging System (cont.)
Through a combination of these hardware, optics, and processing features, the Epson ColorTrue Imaging
System and Epson ColorTrue II Imaging System deliver scanned images with:
1. Hardware components: Epson scanners use a precise scan carriage with better motors to achieve subscan
resolutions that are double or quadruple the scanner's optical resolution. Additionally, Epson scanners
capture Red, Green, and Blue simultaneously, versus other scanners that use one-pass scanning but
alternate Red, Green, and Blue lights for each line of a scan. Epson advantages are:
Better color registration
Faster scanning speeds
Higher quality sub-scan resolutions
Epson Method
(1/2 or 1/4 step carriage movement)
2. Optics: Epson scanners use custom lenses that are designed specifically to work with Epson technology
and the scanner's CCD. These lenses feature:
Larger "sweet spot" and precision lenses for reduced distortion
Accurately aligned lens elements to control sharpness
Glass lenses (versus plastic lenses used by many competitors)
which offer better reflective qualities, providing greater image
quality.
Better image quality than competitive off-the-shelf lenses
because Epson scanners feature custom-made lenses that
match the CCD.
Scanner Technical Brief—Page 4
Smooth gradations
Smooth edges and
minimal color fringing
Greater detail in shadows
Simultaneous RGB Capture
One pass
Accurate colors
Greater detail in
highlights
Sharp image quality
without distortion
Single-Pass Alternate RGB Method
(1/2 step carriage movement)
Small "sweet spot"
can allow edge
distortion
Red Capture
Green Capture
Blue Capture
One pass
Larger "sweet
spot" minimizes
distortion
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