Epson Expression 1680 Special Edition Technical Brief (Scanners)
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- Epson Expression 1680 Special Edition | Technical Brief (Scanners) - Page 1
, and durability. These scanners include the highest quality components. The Epson Perfection® series scanners are designed for home an analog voltage. If a scanner has a resolution of 600 x 2400 dpi, its optical resolution is 600 dpi, which means that it can resolve 600 bits of data per inch. 2. - Epson Expression 1680 Special Edition | Technical Brief (Scanners) - Page 2
to an image based on the mathematical probability of surrounding pixels. For example, if a scanner has a hardware resolution of 1200 x 2400 dpi, and a maximum resolution of 9600 x 9600 dpi, the scanning software uses interpolation to create scanned images with resolutions greater than the hardware - Epson Expression 1680 Special Edition | Technical Brief (Scanners) - Page 3
outputs all data to a software aplication that supports 48-bit image files (such as Adobe® Photoshop®). 48-bit capture 48-bit capture 24-bit transfer 48-bit transfer Image quality Because the scanner captures data that never could have been read by a 24-bit or 30-bit scanner (such as the detail - Epson Expression 1680 Special Edition | Technical Brief (Scanners) - Page 4
) 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. Small "sweet spot" can allow edge distortion Larger "sweet spot" minimizes distortion - Epson Expression 1680 Special Edition | Technical Brief (Scanners) - Page 5
resolution. The benefit of this feature is truer image quality. 300 dpi For example, on one of the Epson 600 dpi Perfection Average Average Average scanners, when scanning an image at 300 dpi, the scanner still uses all 600 pixels per inch to scan the image, then averages the data to yield the - Epson Expression 1680 Special Edition | Technical Brief (Scanners) - Page 6
bed. The Epson Perfection and GT series scanners use a fixed focus optics system. The newest Epson scanners have a fixed focal point just above the surface of the glass for optimized film scanning. 2. AutoFocus optics system: Epson highest-end graphic Epson automatic/manual focus arts scanners use an - Epson Expression 1680 Special Edition | Technical Brief (Scanners) - Page 7
Lens System offers two lenses for two different resolutions. High Resolution lens Some Epson Perfection scanners offers 4800 dpi optical resolution with the High Resolution lens. Document (8.5") Film Area Guide (8") High resolution lens Super Resolution lens For a higher resolution of 6400 dpi - Epson Expression 1680 Special Edition | Technical Brief (Scanners) - Page 8
with a USB port, it will work with a new Epson scanner. You will see only the highest speeds on your scanner if you have a Hi-Speed USB port on both your computer and your scanner. Performance-Batch Scanning Epson scanning software supports batch scanning: Without batch scanning, you must scan - Epson Expression 1680 Special Edition | Technical Brief (Scanners) - Page 9
on the network. Install Epson Scan Server (Windows only) on that computer. Install the Epson TWAIN Pro Network scanner driver on all computers that will access the scanner over the network. Flexibility-Epson Scan with Epson Easy Photo Fix™ Scanning Software Epson Easy Photo Fix technology is - Epson Expression 1680 Special Edition | Technical Brief (Scanners) - Page 10
combines hardware and software to remove dust and scratches on film and remove tears, folds, creases, and deep scratches on photos. This feature is not available on all Epson scanners. Scratch Fold Color photo before DIGITAL ICE Color photo after DIGITAL ICE Scanner Technical Brief-Page 10 6/07 - Epson Expression 1680 Special Edition | Technical Brief (Scanners) - Page 11
trademark and Exceed Your Vision is a trademark of Seiko Epson Corporation. Epson Expression, Epson Perfection, and ColorTrue are registered trademarks and Micro Step Drive, Easy Photo Fix, Epson Smart Panel, are trademarks of Epson America, Inc. All other products and brands are trademarks
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Scanner Technical Brief—Page 1
6/07
This technical brief provides detailed information on the Image Quality, Performance, and Flexibility of Epson
Scanners.
Image Quality—Factors affecting image quality
When comparing scanners, hardware resolution and color pixel depth are two features often used to gauge
image quality. These two features are important, but there are a number of factors that determine image
quality in a scanner, such as the following: (Many of these elements will be discussed in detail in upcoming
sections of this document.)
The Epson Expression
®
and GT series scanners are Epson’s professional series scanners designed for excel-
lence with respect to image quality, speed, usability, versatility, and durability. These scanners include the
highest quality components.
Precision stepper motor
for high quality sub-scan
resolution
Dynamic range control
Type of lamp system used
Optic system
Optical resolution and
color bit depth
Quality of the Analog to Digital con-
verter (ADC); Epson scanners have
optimum performance for minimal
noise and tight color registration.
Type of focus method
Color vs. monochrome CCD
The Epson Perfection
®
series scanners are designed for home and entry-level corporate and graphics arts
users, and are designed with the highest quality components in their price class.
Image Quality—Resolution
A scanner’s resolution determines the amount of data that is read by the scanner. As resolution increases, so
does the file size. Resolution is measured in a variety of ways.
1. Optical resolution:
This is the actual number of pixels read by the CCD (Charge Coupled Device), which
measures the intensity of the light that is reflected from the image to be scanned, and converts it to an
analog voltage. If a scanner has a resolution of 600 x 2400 dpi, its optical resolution is 600 dpi, which
means that it can resolve 600 bits of data per inch.
2. Hardware resolution:
Using a precision stepper motor to double-step or
quadruple-step the carriage, the scanner’s sub-scanner resolution can be
increased. For example, a scanner can have an optical resolution of 1200
dpi, but a hardware resolution of 1200 x 2400 dpi (because it double-steps
the carriage to increase the vertical resolution).
2400 dpi
1200 dpi