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Removing Noise from Documents

When you scan documents that contain a lot of text or figures, noise (unwanted dots or marks) will often appear in the image. This function allows you to remove this noise.

Illustration of removing unwanted dots


  • Removing noise from documents is possible only if the original type is Image PDF (Icon illustration ), and only if the document’s color mode is black and white (1 bit) (Icon illustration ).

  • Punctuation marks such as periods/decimal points (.), colons (:), semicolons (;), commas (,), apostrophes (’), and similar symbols or letters might also be removed from the image. If this occurs, click Icon illustration to undo the edit, adjust the removal area and level, and then perform noise removal again.

This function can be performed using the on-screen items indicated in the following illustration.

Note that this explanation outlines general use of the settings area. For details about a specific setting, see the on-screen balloon help that appears when you click the Icon illustration button.

Application screen numbered callout illustration

  1. Icon illustration , the [Noise Reduction] button

    Click this to remove noise.

  2. Settings area

    When you click Icon illustration , the [Noise Reduction] button, the settings for removing noise will appear here.

    In the thumbnail area, select the page from which you want to remove noise, specify each setting, and then click [Apply].