Xerox DocuMate 4790 User Manual

Also see for Xerox DocuMate 4790: Guide Features guide Setting up User guide

Contents

Scanning from TWAIN and WIAXerox® DocuMate® 4790User’s Guide7-127• Blank threshold—you can use the Threshold slider to fine tune the sensitivity of the blank image detection.The results will depend on the scan settings and the types of documents being scanned. In general leave thethreshold level at the default setting if you are scanning good-quality documents printed on standard 20lbprinter paper. Try lowering the sensitivity level if your documents contain light colored text or drawings sothose pages are not detected as blank. Raise the sensitivity level if you are scanning double-sided light-weight paper where images from the opposite side of the page may appear in the image of the blank side.Clean Up EdgesSelect this option to remove any thin lines from around the edges of the final scan. This option will fill themargins of the image with the detected edge color. When you select this option, the Width input field willautomatically enable for you to input the size of the area you want to have filled with the background color. Youcan specify a fill size between approximately 0.04 to 0.39 inches (1 mm to 10 mm).Automatic Image CroppingDepending on the scanner model and installed software, there may be more than one auto cropping option inthe interface.• Crop to original—select this option to let the scanner automatically determine the size of the item beingscanned. This option is only available if the scanner supports this feature. This option may occasionally begrayed out as not all scanning applications support this feature.Always properly adjust the paper guides to the width of the paper in the input tray so that the pages feedinto the scanner as straight as possible. Skewed pages may not crop properly.• Crop to length—this option tells the scanner to crop the final image to the bottom of the page beingscanned. This option is only available if the scanner supports this feature. This option may occasionally begrayed out as not all scanning applications support this feature.Always properly adjust the paper guides to the width of the paper in the input tray so that the pages feedinto the scanner as straight as possible. Skewed pages may not crop properly.Compression OptionsThere are two types of image compression functions used during scanning. The input compression option iscompressing the image when transferring it from the scanner to the TWAIN driver on the computer. The outputcompression option is the TWAIN driver compressing the image before it sends the image to the scanningapplication. In the scanning interface the input compression option is Compress transfers and the output optionis Compression.Compress transfersSelect this option to have the scanner compress the image in Gray and Color scans. This reduces the file size andallows for faster image transfer from the scanner to the computer. Once the compressed image is on thecomputer, scanner’s driver will then uncompress the image, and perform any image processing functions thathave been selected in the scanning interface. The uncompressed image is then transferred to the scanningapplication. With Compress transfers, a scanning application such as Nuance PDF Converter, will receive theuncompressed image and save the image in whatever file format it uses. You can use the Quality slider to adjustthe level of compression you want to use.