4.9. Vyčištění

4.9.1. Overview

This filter is used to remove small defects due to dust, or scratches, on a scanned image, and also moiré effects on image scanned from a magazine. You should select isolated defects before applying this filter, in order to avoid unwanted changes in other areas of your image. The filter replaces each pixel with the median value of the pixels within the specified radius.

4.9.2. Activating the Filter

This filter is found in the main menu under FiltersEnhanceDespeckle….

4.9.3. Options

Obrázek 17.46. Despeckle filter options

„Despeckle“ filter options

Preview

If checked, parameter setting results are interactively displayed in preview.

Filter Type
Medián

The median value of the pixels within the set Radius around the target pixel is used to replace the target pixel value.

Adaptivní

Adapts the radius to image or selection content by analyzing the histogram of the region around the target pixel. The adapted radius will always be equal to or smaller than the specified radius.

Recursive-Median

Repeats the Median filter action to get a stronger effect.

Recursive-Adaptive

Repeats the Adaptive filter action to get a stronger effect.

Poloměr

Sets size of action window from 1 (3×3 pixels) to 20 (41×41). This window moves over the image, and the color in it is smoothed, so imperfections are removed.

Úroveň černé

Only include pixels brighter than the set value in the histogram (-1-255).

Úroveň bílé

Only include pixels darker than the set value in the histogram (0-256).