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2. Basics of Image Processing / 2.4 Basics for Image Layers

### 2.4.3 Filters

Filters are special image layer tools. Filters are testing each pixel of an image and are replacing it depending on its neighbours. Using different rules for replacing affects the result: the image gets sharper or softer. There are also filters, which enhance the contour of the image content, others create a relief. Those were just a few examples. Enumerating all kind of filters is a nearly endless story.