Epson 4870 - Perfection Pro Руководство - Страница 4

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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

6/07