Despeckle the scanned page content

Speckles are small defects in a scanned image. The small defects occur as extra pixels or collections of extra pixels in the scanned image. The defects can be caused by dust on the document or on the scanning surface. You can despeckle the page content of scanned pages.

NOTE

Light grey areas can be considered as noise.

1. Select the scanned pages that you want to clean up. Click [Select] - [Scanned pages] to select all scanned and rasterised pages.

   • To select a page range: select a page in the structure view, press the <Shift> key, then select another page.

   • To select non-sequential pages: select a page in the structure view, press the <Ctrl> key, then select several non-sequential pages.

2. Click [Pages] - [Clean-up].

   • If required, rasterise the pages that are not recognised as scanned pages.

3. Click the [Despeckle] tab.

4. Select the scanned pages that you want to despeckle.

5. Select if you want to despeckle:

   • [Complete page]

     Use this option if your scanned page contains text only.

   • [Selected area]

     Use this option if your scanned page contains both images and text. Use any of the selection tools to select the area containing text.

     NOTE

     Do not despeckle images.

6. Select to remove:

   • Option [Noise with radius:] can be applied to:

     • black and white pages,

     • greyscale pages,

     • colour pages.

     Speckles that are equal to or smaller than the defined radius in pixels are removed automatically by this application. Option [Noise with radius:] can be applied multiple times for a better despeckle result. Every time you apply option [Noise with radius:] grey images can become whiter and lines can become thinner. Use you own judgement to determine when option [Noise with radius:] does not improve the despeckle result anymore. You can always [Undo] option [Noise with radius:].

   • Option [Objects smaller than:] can only be applied to black and white pages.

     You can define the number of pixel of a speckle manually. You can also drag a box around an object to measure its size with the measurement tool. The application will remove all objects smaller than the defined number of pixels.

7. Click [Apply] to despeckle the scanned page content.