3.8. Selective Gaussian Blur
| 3. 模糊滤镜 |

### 3.8. Selective Gaussian Blur

#### 3.8.1. Overview

图 17.24. The Selective Gaussian Blur filter

Original

Blur applied

Contrary to the other blur plug-ins, the Selective Gaussian Blur plug-in doesn't act on all pixels: blur is applied only if the difference between its value and the value of the surrounding pixels is less than a defined Delta value. So, contrasts are preserved because difference is high on contrast limits. It is used to blur a background so that the foreground subject will stand out better. This add a sense of depth to the image with only a single operation.

#### 3.8.2. Activate the filter

You can find this filter in the image menu under Filters → Blur → Selective Gaussian Blur…

#### 3.8.3. Options

图 17.25. “Selective Gaussian” filter parameters settings

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

  | 注意
  These options are described in 第 2 节 “Common Features”.

Aux input

  If there is another image on screen, you can select it as auxiliary input.

Blur radius

  Here you can set the blur intensity, in pixels.

Max. delta

  Here you can set the maximum difference (0-255) between the pixel value and the surrounding pixel values. Above this Delta, blur will not be applied to that pixel.

3.7. Pixelize |  | 3.9. Variable Blur

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