Brother International MFC-J491DW Online Users Guide HTML - Page 168
Custom Document Size, Background Processing
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• Gray (Error Diffusion) Use for photographic images or graphics. (Error Diffusion is a method for creating simulated gray images without using true gray dots. Black dots are put in a specific pattern to give a gray appearance.) • True Gray Use for photographic images or graphics. This mode is more accurate because it uses up to 256 shades of gray. • 24bit Color Use to create an image with the most accurate color reproduction. This mode uses up to 16.8 million colors to scan the image, but it requires the most memory and has the longest transfer time. 4. Document Size Select the exact size of your document from a selection of preset scan sizes. If you select Custom, the Custom Document Size dialog box appears and you can specify the document size. 5. Brightness Set the Brightness level by dragging the slider to the right or left to lighten or darken the image. If the scanned image is too light, set a lower brightness level and scan the document again. If the image is too dark, set a higher brightness level and scan the document again. You can also type a value in the field to set the brightness level. 6. Contrast Increase or decrease the Contrast level by moving the slider to the right or left. An increase emphasizes dark and light areas of the image, while a decrease reveals more details in gray areas. You can also type a value in the field to set the contrast level. 7. Auto Crop Scan multiple documents placed on the scanner glass. The machine will scan each document and create separate files or a single multi-page file. 8. Advanced Settings Configure advanced settings by clicking the Advanced Settings button in the Scanner Setup dialog box. • Paper Detection - Rotate Image Rotate the scanned image. • Image Quality - Background Processing • Remove Bleed-through / Pattern Prevent bleed-through. 161