Table of Contents
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:
Blur see Section 2, “ Blur filters ”.
Colors see Section 3, “ Color filters ”.
Noise see Section 4, “ Noise filters ”.
Edge-Detect see Section 5, “ Edge-detect filters ”.
Enhance see Section 6, “ Enhance filters ”.
Generic see Section 7, “ Generic filters ”.
Glass Effects see Section 8, “ Glass Effects filters ”.
Light Effects see Section 9, “ Light Effects filters ”.
Distorts see Section 10, “ Distort filters ”.
Artistic see Section 11, “ Artistic filters ”.
Map see Section 12, “ Map filters ”.
Render see Section 13, “ Rendering filters ”.
Web see Section 16, “ Web filters ”.
Animation see Section 15, “ Animation filters ”.
Combine see Section 14, “ Combine filters ”.
Most filters have a Preview where changes in the image are displayed, in real time (if the ΓÇ£PreviewΓÇ¥ option is checked), before being applied to the image.
Figure 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.