3.5. Destripe
| 3. Filtres d'amélioration |

### 3.5. Destripe

#### 3.5.1. Overview

It is used to remove vertical stripes caused by poor quality scanners. It works by adding a pattern that will interfere with the image, removing stripes if setting is good. This « negative » pattern is calculated from vertical elements of the image, so don't be surprised if you see stripes on the preview of an image that has none. And if pattern « strength »; is too high, your image will be striped.

If, after a first pass, a stripe persists, rectangular-select it and apply filter again (all other selection type may worsen the result).

#### 3.5.2. Activating the filter

You can find this filter through Filters → Enhance → Destripe.

#### 3.5.3. Options

Figure 17.24. « Destripe » filter options

Preview

  If checked, parameter setting results are interactively displayed in preview. Scroll bars allow you to move around the image.

Create histogram

  This « histogram » is a black and white image showing the interference pattern more legibly.

Width

  Slider and input box allow to set « strength » of filter (2-100): more than 60 is rarely necessary and may create artifacts.

3.4. Despeckle |  | 3.6. NL Filter

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