User manual AVISION AV3200C

[. . . ] AV3200C ADF/Flatbed Desktop Color Scanner User's Manual ( D/N: 250-0358-0 Rev. 2. 0 ) FCC Radio Frequency Interference Statement This equipment has been tested and found to comply with the limits for a class B digital device, pursuant to Part 15 of the FCC rules. These limits are designed to provide reasonable protection against harmful interference in a residential installation. This equipment generates, uses, and can radiate radio frequency energy and, if not installed and used in accordance with the instruction manual, may cause harmful interference to radio communication. [. . . ] If the scanner is the last device in a SCSI chain the terminator should be switched on. Flatbed--use this setting if you are using the flatbed to scan one page at a time. Duplex/One-page--use this setting if you are using the automatic document feeder (ADF) to scan a doublepage document at a time. Duplex /Multi-page--use this setting if you are using the automatic document feeder (ADF) to scan batches of double-page documents at a time. 4-1 4. 2 DETERMINING YOUR RESOLUTION A good control of the resolution results a satisfactory detail of an image that scans. Normally, the greater the dpi number, the higher the resolution and the image file size. Be aware that the greater resolution takes more time, memory and disk space, therefore, up to a certain degree of dpi, the resolution will not visually be improved, on the contrary, it makes your files more unmanageable. Resolution: 50 dpi Resolution: 100 dpi 4-2 Tips: 1. For your information, an A4 size color image scanned at 300 dpi at True Color mode consumes approximately 25 MB of disk space. A higher resolution (usually means over 600 dpi) is recommended only when you need to scan a small area at True Color mode. 2. You can also refer to the following table to choose a proper resolution while applying your image to other application. Image Scanner Settings Type Application LineArt File, Fax, E-mail Your Document View, Copy, Edit Your True Color Color Picture LineArt OCR* Your Document Resolution (dpi) 200 100 300 *OCR: Stands for Optical Character Recognition, the process to convert an image to a text format. 4-3 4. 3 SELECTING A PROPER IMAGE TYPE Select image type through the mode from the scanner user interface for your own purpose. Each image type is described as follows: Line art(Black and White) LineArt presents the image in black and white only and there are no intermediate shades of gray in between. LineArt is the best choice of image type if you want to scan text, pen or ink drawing. Since only 1-bit of black or white information is required for each pixel*, the disk space required for saving lineArt image is only about 1/24 of that required to save 24-bit true color images. Lineart Image *Pixel: A combination of two words: picture and element, a pixel is a single dot on a computer display or in a digital image. 4-4 Halftone In addition to the black and white display, Halftone simulates gray scale by using different size of dots. Particularly when you view the image at a certain distance, it looks very closely like a gray image yet it consumes the least disk space. Halftone is the picture that we usually see in newspapers or magazines. Since Halftone is one type of black and white image, the disk space required to save a halftone image is 1/24 of that required to save a 24bit true color image. Halftone Image 4-5 8-Bit Gray A single-channel image consists of at least 256 shades of gray. An 8-bit scanner produces a grayscale image with 1024 shades of gray between pure black and pure white. With 8 bits of color information per pixel, the file size of an image is eight times larger than a Black and White image and 1/3 the size of a 24-Bit Color image. Gray Image 4-6 8-Bit Color an 8-Bit Color image provides 256 color hues in the image. The file size of a 256 color image is 1/3 the size of a 24-Bit Color image. 8-Bit 24-Bit Color Color Image A 24-Bit Color image consists of three 8-bit color channels. The red, green, and blue channels are mixed together to create a combination of one billion colors which give a more true-to-life quality to the image. Choose 24-Bit Color if you are scanning color photos. 24-Bit Color Image 4-7 4. 4 ENHANCING YOUR IMAGE Brightness: Adjusts the lightness or darkness of an image. The higher the value, the brighter the image. Increase your Brightness 4-8 4. 5 CONTRAST Adjusts the range between the darkest and the lightest shades in the image. The higher the contrast, the bigger the different gray scales. Increase your Contrast 4-9 4. 6 INVERT IMAGE The invert command reverses the brightness and the color in the image. [. . . ] Upper Part of the Pad Clamp Figure 6-4 Installing the pad module 5-5 6. TROUBLE SHOOTING The scanner will automatically perform a simple selftest each time it is turned on. When the test is completed, if no error occurs, the READY LED is steadily on. If you have problems with the operation of your scanner, please check the following troubleshooting hints. 6. 1 QUESTION AND ANSWER Question: The LED indicates that the scanner is ready, but the scanner does not respond to the scan command from the host computer. [. . . ]