### 8.47. Destripe

#### 8.47.1. Généralités

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).

#### 8.47.2. Activating the Filter

This filter is found in the main menu under Colors → Tone Mapping → Destripe….

#### 8.47.3. Options

Figure 16.206. « 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.

8.46. Stress |  | 8.48. Retinex

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