User Manual

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 gray 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 rasterized 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, rasterize the pages that are not recognized as scanned pages.

3. Click the [Despeckle] tab.

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

5. Specify whether 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:

• The [Noise with radius:] option can be applied to:

• black and white pages,

• grayscale pages,

• color 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:] gray images

can become whiter and lines can become thinner. Use you own judgment to determine

when option [Noise with radius:] does not improve the despeckle result anymore. You can

always [Undo] option [Noise with radius:].

• The [Objects smaller than:] option 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.

Despeckle the scanned page content

Chapter 4 - The [Pages] workspace

PRISMAprepare v7.1.1