User manual AVISION AV8050U-G

[. . . ] High Speed Document Scanner User's Manual Regulatory model: DT-0603H Trademarks Microsoft is a U. S. IBM, PC, AT, XT are registered trademarks of International Business Machines Corp. Other brands and product names herein are trademarks or registered trademarks of their respective holders. No part of this publication may be reproduced, transmitted, transcribed, stored in a retrieval system, or translated into any language or computer language, in any form or by any means, electronic, mechanical, magnetic, optical, chemical, manual, or otherwise, without the prior written permission of Avision Inc. [. . . ] If Automatic is selected and there is document in both the auto document feeder (ADF) and the flatbed, then the scan source will be automatically set to ADF. 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. 2. 3 SCANNING COLOR IMAGES The following options are available for scanning color images. Brightness Contrast Resolution Invert 33 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 34 4. 3 THE COMPRESSION TAB The Compression tab allows you to compress your scanned image and choose the level of compression. Bi-tonal 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 35 The Compression tab dialog box 36 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 37 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 38 Remove Blue, Threshold: 20, Background: 255 Remove Blue, Threshold: 20, Background Level: 210 39 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, MultiFeed Detection). The Paper tab dialog box 40 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. [. . . ] However, it still needs to be cleaned occasionally to ensure optimum image quality and performance. From time to time the pad assembly and feeding rollers may become contaminated with ink, toner particles or paper dust. In this case the scanner may not feed documents smoothly or several documents may feed at once. If this occurs please follow the cleaning procedures to return your scanner to its original state. [. . . ]