User manual AVISION AV3750

[. . . ] High Speed Document Scanner User's Manual Regulatory model: 300500001/300500002 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. However, there is no guarantee that interference will not occur in a particular installation. [. . . ] If Automatic is selected and there is document only in flatbed, then the scan source will be set to flatbed. Note the options vary based on type of scanner. 4-13 4. 2. 3 SCANNING COLOR IMAGES The following options are available for scanning color images. Brightness Contrast Resolution Invert 4. 2. 4 SCANNING GRAYSCALE IMAGES The following options are available for scanning gray images. Brightness Contrast Resolution Invert 4. 2. 5 SCANNING B&W IMAGES The following options are available for scanning B&W images. Binarization (Dynamic Threshold) Resolution Invert Or Binarization (Fix Processing) Threshold Brightness Resolution Invert 4-14 4. 3 THE COMPRESSION TAB The Compression tab allows you to compress your scanned image and choose the level of compression. Bitonal images are normally compressed using CCITT standard called Group 4 (G4). Color and grayscale images are often compressed using JPEG technology. Move the JPEG Quality slider to the right or left to increase or decrease the level of compression. If your image editing application does not support the type of compression format, then either a warning message will appear or the image quality of the compressed file will not be acceptable. This group developed and lent their name to a file compression standard for color and grayscale images that is widely used by scanners, and software applications. On Microsoft Windows-based systems, a file with the extension . jpg has normally been compressed using this standard. For scanning color or gray images, the following compressions are available: None JPEG For scanning B&W images, the following compressions are available: None G4 4-15 The Compression tab dialog box 4-16 4. 4 THE COLOR DROPOUT TAB 4. 4. 1 COLOR DROPOUT SELECTION Color Dropout tab allows you to drop either of the red, blue, or green color in your scanned image. If your image contains red color watermark or background, choose the R (Red) channel then any red watermark or background will be removed. This feature is used to sharpen your text when using OCR (Optical Character Recognition) software. Note that this function supports only black & white and gray images. Therefore, be sure to choose any black & white or gray image type while applying this function. The Color Dropout dialog box 4-17 4. 4. 2 OTHER COLOR DROPOUT OPTIONS Advanced Processing provides two options that can adjust your scanned image in the best optimal result. Filter Threshold This value is used to determine the color which will be dropped out. A lower value will drop more of the selected color out, while a higher value will leave more of the selected color in. The pixel which is higher than the background value will be adjusted to the lightest point. Adjust the value for both the Filter Threshold and Background Level to produce the best optimal result. Background Level Example, slightly adjusting the background value makes your text more clear. Original 4-18 Remove Blue, Threshold: 20, Background: 255 Remove Blue, Threshold: 20, Background Level: 210 4-19 4. 5 THE PAPER TAB The Paper tab allows you to define values relating to image output (i. e. , Auto Crop or not, Scan Area, OverScan, Multi-Feed Detection). The Paper tab dialog box 4-20 4. 5. 1 CROPPING Cropping allows you to capture a portion of the document being scanned. Options Automatic Description Automatic adjusts the cropping window according to different document sizes. If you select this option, you can use the arrow keys to define the x and y offset values, width and length to redefine your scanned area. [. . . ] If you have problems with the operation of your scanner, please check the following troubleshooting hints. 7. 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. a) Please check if the signal cable is firmly seated, and invoke the scan command again. If there is still no response, please reset the scanner by turning it off and then on again, and reboot your host computer as well. [. . . ]