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When I scan a newspaper, magazine, brochure or other commercially-printed material, the scanned image is blurred or has a cross-hatch pattern

RELATES TO:

  • Epson Scanners and All-In-One products
  • Scanned image quality issues

EXPLANATION:

The print in magazines, newspapers, brochures or similar commercially-printed publications is arranged into patterns of dots. These dots are only visible upon close inspection, but when viewed as a whole, make up the text, graphics and images on the page. Halftoning was used to provide a more automated process than using a cross-hatching technique to create the various tones within images and graphics.

Moiré (cross-hatch) patterns may appear in the final scanned image of a printed document if appropriate adjustments are not made in the scanning software. Moiré patterns are caused by interference from the differing pitches in the scanner's screen and the halftone screen in your original.

SOLUTION:

In order to reduce or eliminate moiré appearing in the final scanned image, select the appropriate document/image type, and make sure that the Descreening Filter is ticked in your Epson scanning software.

We recommend that you do not use the automatic mode of your scanning software. The automatic Document Type Recognition function of EPSON TWAIN does not feature 'magazine' or 'newspaper' amongst its document types; therefore you should switch to the Manual mode. The Full Auto Mode of EPSON Scan is not recommended for removing moiré patterns, however the Home and Professional modes are all suitable for this task. Office Mode can be used providing the document is positioned on the document table.

Original image with moiré pattern Descreening Filter applied


For detailed instructions, follow the section for your scanning software:



EPSON TWAIN

  1. Open your scanning software. If it starts scanning automatically, click on Cancel. Click the Manual mode button to open the Manual mode window.
  2. Select the Flatbed as the Document Source. Then select either Color Document (24-bit colour) or Black & White Document (8-bit grey) from the Image Type list.
  3. Use the Destination list to select a predefined or user-defined settings, or use the Destination button to customise Destination settings.

    Note:

    High quality prints are set using halftone screens producing 150lpi (lines per inch). Magazines are usually set at 133lpi, and newspapers at 85lpi. When scanning halftones to output at the same size as the original, the usual rule is to double the halftone output screening resolution (lpi). As you are never likely to handle halftones above 150lpi, you never need scan at a resolution above 300dpi.


  4. Turn on the Descreening filter.

    When the Image Type is set to 'Color Document' or 'Black & White Document', the De-screening setting is set to 'On' by default. If you have previously changed the pre-defined settings you can click on the Image Type button and check that the De-screening setting is On and set Scanning Mode to Best for either Color Document or Black & White Document. Then click OK.

    Note:

    De-screening appears dimmed and is not available when Pixel Depth is set to Black & White. De-screening is available when the resolution is set from 25 to 800 dpi.



EPSON Scan

  1. Open your scanning software. If it starts scanning automatically, click on Pause. Click the arrow in the Mode box at the top right of the EPSON Scan window. Then select Home Mode or Professional Mode from the list that appears.
  2. Do one of the following to select your document type:

    • Home Mode: Click the arrow to open the Document Type list and select the type of original you are scanning - either Newspaper or Magazine. Then click the Color, Grayscale, or Black & White button to select the colours in the original.
    • Professional Mode: Select the Reflective as the Document Type. Then select Document Table as the Document Source. Click the arrow in the Auto Exposure Type list and select Document.

      Note:

      You cannot remove moiré patterns when you are scanning film or monochrome images.


  3. Do one of the following to select your destination setting(s):

    • Home Mode: Click the button for the way you plan to use the scanned image in the Destination box:

      • Screen/Web for images you will view only on a computer screen or post on the web.
      • Printer for images you will be printing or converting to editable text with an OCR (Optical Character Recognition) program.
      • Other if you want to select a specific resolution for other purposes.

    • Professional Mode: Click the arrow to open the Image Type list and select the detailed image type you are scanning. You can accept the Resolution setting given by Epson Scan or set it manually at any time. You cannot remove moiré patterns when you are scanning using a resolution higher than 601 dpi.

    Note:

    High quality prints are set using halftone screens producing 150lpi (lines per inch). Magazines are usually set at 133lpi, and newspapers at 85lpi. When scanning halftones to output at the same size as the original, the usual rule is to double the halftone output screening resolution (lpi). As you are never likely to handle halftones above 150lpi, you never need scan at a resolution above 300dpi.


  4. Turn on the Descreening filter.

    • Home Mode: Make sure that there is a check in the box beside Descreening Filter in the Image Adjustments section. This is normally set by default when Magazine or Newspaper is selected as the Document Type.
    • Professional Mode: Make sure that there is a check in the box beside Descreening Filter in the Image Adjustments section, and deselect the Unsharp Mask setting. The Descreening Filter has several Screen Ruling settings. You can change the Screen Ruling as appropriate, depending on the type of original you are scanning. The available settings are 'General', 'Newspaper 85lpi', and 'Magazine 133lpi'. A 'Fine Prints (175lpi)' setting is also available in some editions of EPSON Scan.

      Note:

      You cannot remove moiré patterns when you are scanning film or monochrome images, or scanning using a resolution higher than 601 dpi.


    Epson Scan - Home Mode Epson Scan - Professional Mode


Previewing and Scanning your document

You're now ready to Preview your original. If you preview the image in the Normal mode (Epson Scan) or with the Full Preview button (Epson TWAIN), we recommend selecting the scan area (image) on the preview before scanning or previewing again.

Do this by using the Auto Locate button on the Preview window, or use Zoom Preview, then draw a marquee and Preview again.

Note:

The Descreening Filter improves results when scanning magazine or newspaper images which include screening in their original print processes. The results of the Descreening Filter do not appear in the preview image, only in your scanned image.


When you have finished selecting scan settings, you are ready to scan. Click the Scan button. After a few moments, your images are scanned. Check the scanned image to see the result.


To further improve results, you could try the following:

  • Select a lower Resolution setting (to make the image size smaller).
  • Place a transparent sheet such as an overhead projector sheet, between the document and the document table.
  • Reposition the document slightly. Always make sure that the original is correctly positioned on the document table and is not at an angle.
  • In EPSON Scan, use Professional Mode and set an appropriate Screen Ruling for the type of original you are scanning.
  • In EPSON TWAIN, un-tick/clear the box next to Unsharp Mask in the Manual mode window.


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