User manual VISIONEER ONETOUCH 8820 INSTALLATION GUIDE

[. . . ] Visioneer® OneTouch® 8820 Scanner FOR USB CONNECTION Installation Guide COPYRIGHT INFORMATION Copyright © 2001 Visioneer, Inc. , a wholly owned subsidiary of Primax Electronics LTD. Reproduction, adaptation, or translation without prior written permission is prohibited, except as allowed under the copyright laws. The Visioneer brand name and logo are registered trademarks of Primax Electronics LTD. OneTouch is a trademark of Primax Electronics LTD. [. . . ] Clicking one of those outlines also selects it as the page size for the scan. If 30 VISIONEER ONETOUCH 8820 SCANNER INSTALLATION GUIDE you select the Custom option from the drop-down list, boxes appear in place of the picture. Enter the horizontal and vertical page dimensions in the boxes. AutoCrop--Select this option to let the scanner automatically determine the size of the item being scanned. For example, if you put a photo in the middle of the glass, the scanner will automatically determine the size of the photo. When AutoCrop is selected, the scanner makes two passes--the first pass senses the item's size, and the second pass scans the image. This option overrides the Page Size menu selection. DeScreen--Select this option when scanning a picture from a newspaper or magazine article, or other item that contains images with patterns or dots. Scans of patterns or dots sometimes have a distorted or wavy appearance. The scanner scans the item to compensate for the patterns and dots, and produces a clearer image. The scanning may slow down a bit when this option is selected. You don't need to select this option when scanning photographs. The DeScreen setting does not apply to the Black/White mode. Gamma--Drag the slider to improve how the colors in a scanned image look on your monitor. Gamma correction allows you to achieve precise color matching. Because the computer cannot always transmit the exact color information to the hardware, you may have to make some color adjustments using the Gamma feature. The default Gamma setting works fine in most cases and normally does not need to be adjusted. CONFIGURING THE SCANNER 31 6. If a JPEG tab is available, click it to select image compression settings. Please see "About JPEG Compression" on page 32 for information about the JPEG settings. Enable hardware compression (JPEG) --Click to make the JPEG compression options active. Minimize Image Size (Maximum compression)--Select this option to produce the smallest file size for the image; image quality is lowest. Best Image Quality--Select this option to produce the best quality image; file size is larger. Custom Quality Factor--Set your own choice for file size and image quality. [. . . ] The User Preferences dialog box appears. 2. Select the preferences you want: s Enable selection of color bitdepths. . . --your OneTouch 8820 scanner supports a tremendous range of colors (defined as 48-bit depth enhanced color), but other devices (called the TWAIN clients), such as older cameras that you can use with the Scan Manager Pro support only a 24-bit depth range of colors. Select this option to automatically allow the Scan Manager Pro's color settings to support more than a 24-bit depth if the other devices also support the greater range of colors. Then, when you open the Scan Manager Pro from other applications, options for bit depth include the higher settings. [. . . ]