User manual EPSON SCANNERS BROCHURE

[. . . ] 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). 1200 dpi 2400 dpi Scanner Technical Brief--Page 1 6/07 Image Quality--Resolution (cont. ) 3. Interpolated resolution: Interpolation is a method to increase the resolution of an image. It uses a complex algorithm to "add" pixels to an image based on the mathematical probability of surrounding pixels. [. . . ] 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. Small "sweet spot" can allow edge distortion Larger "sweet spot" minimizes distortion Scanner Technical Brief--Page 4 6/07 Image Quality--Epson ColorTrue® Imaging System (cont. ) 3. Processing: Many Epson scanners use a custom ASIC (Application Specific Integrated Circuit) for fast scanning. Key features include: Line correction captures and processes full RGB color for every pixel and minimizes color fringing in subscan direction. Zoom capability enables smoothest edges along diagonal or curved lines and achieves higher interpolated resolution On-board memory allows for Auto Area Segmentation (AAS) and Text Enhancement Technology (TET) processing within the scanner--AAS and TET are independent from PC or Macintosh processing, allowing the scanner to work with better "raw" data. Epson Method: Additionally, Epson scanners have a pixel optimization feature 600 dpi that uses the full resolution of the scanner's CCD, even scanning at a lesser resolution. The benefit of this feature is truer image 300 dpi quality. 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 lower resolution image. Some competitive models lower resolution by turning off some pixels to capture less image data. Competitive Method: 600 dpi 300 dpi On Off On Off On Off Image Quality--Color CCD All Epson scanners use a color CCD which uses a single white light source, instead of a monochrome CCD and three light sources. The color CCD results in faster scanning speeds and the ability to scan threedimensional objects without producing color "ghosts. " Key Differences Color CCD How it works Red, green, and blue are quickly captured in the color CCD illuminated by a single light source. Glass Monochrome CCD three separate lamps are fired for eachline of a scan, slowing the scanning speed. Glass Color CCD White light source Monochrome CCD Red light source Green light source Blue light source Result when Single light source allows precise scanning three- alignment when scanning non-flat dimensional objects surfaces The three lamps can cause misalignment when reflected from non-flat surfaces. Scanner Technical Brief--Page 5 6/07 Image Quality--Dynamic Range Dynamic range measures the difference between the lightest highlights and darkest shadows that a scanner can perceive (on a scale of 3. 0 to 4. 0). The maximum density rating is referred to as Dmax. A dynamic range measurement is important for designers who scan transparent media (such as slides, transparencies, and negatives) because the media itself generally has a dynamic range of 3. 2. Reflective media, such as a photograph, generally does not have a dynamic range greater than 2. 0. A high dynamic range results in scanned images Superior detail in highlights Superior detail in shadows with superior detail in highlights and in shadows-- especially when scanning transparent media. Image Quality--Focus Method Epson scanners use a fixed focus system, AutoFocus optics system, or a Dual-Focus mechanism. Fixed Focus: With this type of focus system, the lens is set to record everything sharply from a fixed distance--from the lens to the glass scanning 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. AutoFocus optics system: Epson highest-end graphic arts scanners use an AutoFocus optics system that can be used in AutoFocus mode or manual mode. This system offers these benefits: The Epson manual/automatic focus optics system gives you precised sharpness control, especially when scanning three-dimensional objects and transparencies. With three-dimensional images, you can pick your point of focus so that background items are captured with sharp detail, as shown in the glove and towel in the images to the right. For super sharpness when scanning transparencies or slides mounted in holders, you can set the focus to compensate for the 2. 5mm distance between the glass and the slide. Standard fixed focus 3. Dual-Focus mechanism: One of the Epson Expression series scanners uses a Dual-Focus mechanism. When using the scanner's custom film holders to scan transparent media, you can set the scanner's focal distance to compensate for the 2. 5mm distance between the glass and the media. [. . . ] These elements include the Densitometer (a tool that allows a user to hit a specific color via numerical data), Multiple Marquee (for batch scanning), and Histogram (to correct tonal distribution). Office Mode: For the business user--the Office Mode is helpful when you need to scan a large number of documents with the same size, using the optional Automatic Document Feeder. You can scan documents easily and quickly without preview in this mode. Flexibility--DIGITAL ICETM technology from Applied Science FictionTM DIGITAL ICE technology from Applied Science Fiction(ASFTM) is a scanner feature that 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 Flexibility--Epson Smart PanelTM software Epson Smart Panel allows you to scan and send data directly to an assigned application or to the Epson photo-sharing site. You can also obtain photos and documents in digital form quickly and easily. This version of the Epson Smart Panel includes the following features: RePrint Photos Scan and Save Copy Center Edit Text Business Card Scan for Creativity Scan to Application Scan to E-mail Epson Photo Site Flexibility--Fluid Mount Accessory In cases where film holders are not the best solutions for film scanning, the fluid mount accessory offers: Scratch removal from film not supported by DIGITAL ICETM technology such as black and white film Easy scanning of film that won't fit into standard film Scanned on the document glass, this image shows Newton rings and scratches. [. . . ]