Workflow Assistant – Scan Images
General
Mode: Select Color if you want color in your output document. This requires most time and memory. Select Grayscale to have so-called ‘black-and-white’ photographs in the output document. Use this for pages with low or varying contrast and with text on colored or shaded backgrounds. Select B&W for black-and-white scanning. This is not suitable if you want photographs in the output document. Use this for crisp black texts on a white or light background.
Resolution: Choose a scanning resolution. The values offered are scanner dependent. In general, 300 dpi is best for OCR accuracy. 400 dpi may be better for very small print.
Size: Choose the paper size you will be scanning. This also determines the page size of the output document.
Orientation: Specify how the pages will be placed in the scanner. Portrait means the shorter edge of the page will be parallel to the scanning head. Landscape means the longer edge will be parallel to the scanning head.
Source: Select the scanner source (sheetfed or flatbed) you are going to use.
Brightness: Use this to make a brightness setting. Good brightness and contrast settings play an important role in OCR accuracy. If characters are thick and touching, lighten the brightness. If characters are thin and broken, darken it. See Optimizing brightness for examples of optimum and marginal image brightness.
Contrast: Use this to make a contrast setting. Good brightness and contrast settings play an important role in OCR accuracy. If a page has low contrast (that is, not much difference between light and dark) set a high contrast value, or scan grayscale.
Flatbed
Prompt for more pages: Select this to be prompted to add more pages for workflow processing.
Automatically scan pages: Select this to help you scan multi-page documents efficiently even if you do not have an ADF. The scanner will start scanning passes automatically, pausing by the number of seconds you define. A dialog box allows you to scan immediately, request a longer pause and specify when the last page is scanned.
Time between scans: Specify how many seconds the scanner should wait before starting a new scan. This gives you time to place the next page in the scanner.
Preprocessing
Page rotation: Select Automatic to have OmniPage check orientation and automatically rotate an improperly oriented page image, or select the desired rotation angle or None.
Despeckle image: Select this to have spots removed from images automatically. If it is deselected you can still remove spots from an image manually with the Despeckle tool.
Deskew image: Select this to have all pages straightened automatically, if necessary.
Look for facing pages: Select this to process facing pages of an open book as two separate pages even if they were scanned in one step.
Keep original image resolution: Select this to keep original resolutions for grayscale and color images entering the program. Do this if you need high quality image export, for page image saving and for images embedded in recognized pages. Deselect this to have grayscale and color images reduced to 75-150 dpi.
Auto-crop: Select this to have margins detected and reduced to a minimum; this may resize pages with different margin settings.
Clean borders: Select this to remove scanning shadows, spots and marginal notes from page margins.
Remove punch holes: Select this to remove the effects of punch holes from the page images.
Blank Pages
Skip blank pages: Drop these during pre-processing. If you select this, blank pages cannot be used as document separators (see below).
Sensitivity: The is a setting for blank page detection. The default is 50 in a range from 0 to 100. The higher the sensitivity, the less likely it is for a page to be declared blank; for instance with sensitivity at 100 the page must be absolutely clean to be declared blank.
Create new document at each blank page: Select this option to create a separate output document each time a blank page is found. It has no effect if Skip blank pages is selected.