Xerox DocuMate 5445 User Manual page 162

Automatic Image Cropping
Depending on the scanner model and installed software, there may be more than one auto cropping option in the
interface.
• Crop to original—select this option to let the scanner automatically determine the size of the item being
scanned. This option is only available if the scanner supports this feature. This option may occasionally be
grayed 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 feed into
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 being
scanned. This option is only available if the scanner supports this feature. This option may occasionally be
grayed 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 feed into
the scanner as straight as possible. Skewed pages may not crop properly.
Compression Options
There are two types of image compression functions used during scanning. The input compression option is
compressing the image when transferring it from the scanner to the TWAIN driver on the computer. The output
compression option is the TWAIN driver compressing the image before it sends the image to the scanning
application. In the scanning interface the input compression option is Compress transfers and the output option is
Compression.
Compress transfers
Select this option to have the scanner compress the image in Gray and Color scans. This reduces the file size and
allows for faster image transfer from the scanner to the computer. Once the compressed image is on the computer,
scanner's driver will then uncompress the image, and perform any image processing functions that have been
selected in the scanning interface. The uncompressed image is then transferred to the scanning application. With
Compress transfers, a scanning application such as Nuance PDF Converter, will receive the uncompressed image and
save the image in whatever file format it uses. You can use the Quality slider to adjust the level of compression you
want to use.
When the Quality option is set to High quality, there is very little visual difference between a compressed scan and
an uncompressed scan. When the quality option is set to High compression, there may be a greater visual
difference between compressed and uncompressed scans.
Quality
You can fine tune the compression level by adjusting the quality slider between high compression and high quality.
When the quality level is set to high compression, the scanner will scan and transfer images faster than high quality,
but the image quality of the output scan will be lower.
Subsampling
The subsampling options allow you to select the encoding ratio between color information and luminosity.
Subsampling works by lowering the resolution of the RGB colors found in an image without affecting luminescence
of the image. This compresses the image to create smaller file sizes but it can sometimes result in loss of image
quality. Depending on the type of image being scanned, subsampling encoding may not have a noticeable affect
in the final image file. You should try test scans using the different levels of subsampling to make sure you are happy
with the image quality.
• 4:4:4—no subsampling and the ratio between color and luminosity remains unchanged.
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Xerox DocuMate
User's Guide
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