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Located in the Scan Preview Window/Advanced Tab you can set the resolution to scan in a document.
Scanning resolution is measured in dots per inch (DPI) and determines the amount of detail visible in an image. To get the best possible results you should carefully choose the resolution best suited to the image you’re scanning. For most Black & White document we recommend B&W at 200x200 for 8.5x11 document.
It is not always necessary to choose the highest possible resolution to get a good quality scan. If the image has little detail or is only black and white, you can use a lower resolution. This helps reduce the size of the file, as images scanned at higher resolutions require more disk space.
You should also consider the capabilities of your output device. If you intend to print the scanned image, you should try to match the scan resolution to your printer’s capabilities. An image scanned at 600dpi and printed on a 300dpi printer will result in a 300dpi image. If you intend to edit the image, the scan resolution you choose should be appropriate for your display. For example, if you scan an image at 600dpi and display it at a lower resolution, you won’t see all the information, which could make editing details difficult.
The most important thing to remember when choosing a resolution is that you want to get the highest possible image quality without making the file any larger than necessary.
Tip:
OCR conversion generally requires a minimum resolution of 200dpi.
Not all scanner report back during the scanning process what additional adjustments were select via the twain interface. As a result DX will use its default settings as defined in the dialog above.