Xerox DocuMate 152i Scanning Manual

Also see for DocuMate 3120: User guide

Xerox DocuMate 152i Scanning Manual Manual pdf 34 page image

TWAIN Scanning Guide Document Settings30 User’s GuideCompress transfersSelect this option to have the scanner compress the image in Gray and Color scans. This reducesthe file size and allows for faster image transfer from the scanner to the computer. Once thecompressed image is on the computer, the scanner’s driver will then uncompress the image, andperform any image processing functions that have been selected in the scanning interface. Theuncompressed image is then transferred to the scanning application. With Compress transfers, ascanning application such as Nuance PDF Converter, will receive the uncompressed image andsave the image in whatever file format it uses. You can use the Quality slider to adjust the level ofcompression you want to use.QualityYou can fine tune the compression level by adjusting the quality slider between high compressionand high quality. When the quality level is set to high compression, the scanner will scan andtransfer images faster than high quality, but the image quality of the output scan will be lower.SubsamplingThe subsampling options allow you to select the encoding ratio between color information andluminosity. Subsampling works by lowering the resolution of the RGB colors found in an imagewithout effecting luminescence of the image. This compresses the image to create smaller filesizes but it can sometimes result in loss of image quality. Depending on the type of image beingscanned, subsampling encoding may not have a noticeable effect in the final image file. Youshould try test scans using the different levels of subsampling to make sure you are happy with theimage quality.• 4:4:4—no subsampling and the ratio between color and luminosity remains unchanged.• 4:2:2—mid-level ratio between color and luminosity.• 4:1:1—highest ratio difference between color and luminosity, which results in saving thesmallest file size.CompressionThis option is specific compression for file and memory transfers to an application. It is onlyavailable if the application you are using can accept a compressed image file. For instance, if yourscanning application is set to receive JPEG compressed images, then the Compression field willdisplay JPEG. Otherwise, the status for Compression will always be disabled and displayUncompressed because the scanning application you are using is requesting an uncompressedimage.When this option is available, it is an advanced user and application option and should not beadjusted if you are not familiar with the technology. However, if you are certain that you are usingan application that can receive a compressed image, and you want to be able to change theimage compression type, you will need to enable user adjustable compression in the scanninginterface. Please refer to the “Driver Settings” section for instructions.Please note that if you adjust this setting, and the application cannot actually accept the optionyou change, the scanning interface and the application may crash. It is highly recommended thatyou leave the default options and let the application set any image compression.From the Windows Control Panel1. Click on the Driver settings tab.