第 16 章 虑镜
| 部分 III. 函数参考 |

## 第 16 章 虑镜

## 1. Introduction

A filter is a special kind of tool designed to take an input layer or image, apply a mathematical algorithm to it, and return the input layer or image in a modified format. GIMP uses filters to achieve a variety of effects and those effects are discussed here.

The filters are divided into several categories:

- 第 2 节 “Blur Filters”

- 第 3 节 “Enhance Filters”

- 第 4 节 “Distort Filters”

- 第 5 节 “Light and Shadow Filters”

- 第 6 节 “Noise Filters”

- 第 7 节 “Edge-Detect Filters”

- 第 8 节 “Generic Filters”

- 第 9 节 “Combine Filters”

- 第 10 节 “Artistic Filters”

- 第 11 节 “Decor Filters”

- 第 12 节 “Map Filters”

- 第 13 节 “Rendering Filters”

- 第 14 节 “ Web Filters ”

- 第 15 节 “Animation Filters”

- 第 16 节 “Alpha to Logo Filters”

### 1.1. Preview

Most filters have a Preview where changes in the image are displayed, in real time (if the “Preview” option is checked), before being applied to the image.

图 16.1. Preview submenu

Right clicking on the Preview window opens a submenu which lets you set the Style and the Size of checks representing transparency.

12.8. GIMP online |  | 2. Blur Filters