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## Chapter 7. Filters

## 1. Filter 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. The GIMP uses filters to achieve a variety of effects and those effects are discussed here.

The filters are divided into several categories:

- Blur

- Colors

- Noise

- Edge-Detect

- Enhance

- Generic

- Glass Effects

- Light Effects

- Distorts

- Artistic

- Map

- Render

- Web

- Animation

- Combine

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