5.16. Vír a zaškrcení
| 5. Filtry zkreslení |

### 5.16. Vír a zaškrcení

#### 5.16.1. Overview

Obrázek 17.97. Example for the Whirl and Pinch filter

Original image

Aktivace filtru

Vír a zaškrcení provádí koncentrické zkreslení obrázku.

„Whirl“ (applying a non-zero Whirl angle) distorts the image much like the little whirlpool that appears when you empty your bath.

„Pinch“, with a nil rotation, can be compared to applying your image to a soft rubber surface and squeezing the edges or corners. If the Pinch amount slider is set to a negative value, it will look as if someone tried to push a round object up toward you from behind the rubber skin. If the Pinch amount is set to a positive value, it looks like someone is dragging or sucking on the surface from behind, and away from you.

| Tip
Efekt zaškrcení lze někdy použít pro kompenzaci soudkovitého zkreslení objektivu fotoaparátu.

Obrázek 17.98. Illustration

Původní obrázek

Vír

Zaškrcení

#### 5.16.2. Activating the filter

You can find this filter through Filters → Distorts → Whirl and Pinch…

#### 5.16.3. Nastavení parametrů

Obrázek 17.99. „Whirl and Pinch“ filter options

Presets, „Input Type“, Clipping, Blending Options, Preview, Split view

  | Poznámka
  These options are described in 2 – „Common Features“.

Whirl

  The clockwise or counter clockwise angle (-360 to +360). Controls how many degrees the affected part of the image is rotated.

Pinch

  The pinch amount (-1 to +1) determines how strongly the affected part of the image is pinched.

Poloměr

  Whirlpool width (0.0-2.0). Determines how much of the image is affected by the distortion. If you set `Radius` to 2, the entire image will be affected. If you set `Radius` to 1, half the image will be affected. If `Radius` is set to 0, nothing will be affected (think of it as the radius in a circle with 0 in the center and 1 halfway out).

5.15. Vlny |  | 5.17. Vítr

Report a bug in GIMP Report a documentation error