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TWAIN Driver Settings (Mac)

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  • Item names and assignable values will vary depending on the machine.
  • The Contrast setting is available only when selecting Gray (Error Diffusion), True Gray, or 24bit Color from the Scan Type options.
  1. Resolution
    Select a scanning resolution from the Resolution pop-up menu. Higher resolutions take more memory and transfer time, but produce a finer scanned image.
  2. Scan Type
    Select from a range of scan colour depths.
    • Black & White
      Use for text or line art images.
    • Gray (Error Diffusion)
      Use for photographic images or graphics. (Error Diffusion is a method for creating simulated grey images without using true grey dots. Black dots are put in a specific pattern to give a grey appearance.)
    • True Gray
      Use for photographic images or graphics. This mode is more accurate because it uses up to 256 shades of grey.
    • 24bit Color
      Use to create an image with the most accurate colour reproduction. This mode uses up to 16.8 million colours to scan the image, but it requires the most memory and has the longest transfer time.
  3. Document Size
    Select the exact size of your document from a selection of preset scan sizes.
    • If you select Custom, you can specify the document size.
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  4. Adjust Image
    Click the Adjust Image button to adjust other image qualities.
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    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 box to set the brightness.
    Contrast
    Increase or decrease the Contrast level by moving the slider to the right or left. An increase emphasises dark and light areas of the image, while a decrease reveals more details in grey areas. You can also type a value in the box to set the contrast.
    Reduce Noise
    Improve and enhance the quality of your scanned images with this selection. The Reduce Noise option is available when selecting the 24bit Color option and the 300 x 300 dpi, 400 x 400 dpi, or 600 x 600 dpi scan resolutions.
  5. Rotate Image
    Rotate the scanned image.
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