3.2. Gaussian Blur

3.2.1. Overview

Figuur 17.10. Example for the Gaussian Blur filter

Example for the Gaussian Blur filter

Original

Example for the Gaussian Blur filter

Blur applied


The Gaussian Blur plug-in acts on each pixel of the active layer or selection, setting its Value to the average of all pixel Values present in a radius defined in the dialog. A higher Value will produce a higher amount of blur. The blur can be set to act in one direction more than the other by clicking the Chain Button so that it is broken, and altering the radius. GIMP supports two implementations of Gaussian Blur: FIR and RLE. They both produce the same results, but each one can be faster in some cases.

3.2.2. Activate the filter

You can find this filter in the image menu under FiltersBlurGaussian Blur…

3.2.3. Options

Figuur 17.11. Gaussian filter parameters settings

Gaussian filter parameters settings

Presets, Preview, Split view

These options are common to GEGL-based filters. Please refer to Paragraaf 2, “Common Features”.

Size X, Size Y

Here you can set the blur intensity. By altering the ratio of horizontal to vertical blur, you can give the effect of a motion blur.

Filter

None: default option: no FIR nor RLE filter is applied.

FIR: stands for Finite Impulse Response. For photographic or scanned images.

RLE: stands for run-length encoding. RLE Gaussian Blur is best used on computer-generated images or those with large areas of constant intensity.

Abyss policy

Abyss policy (border management) is treated with Abyss policy.

Clip to the input extent

Should the output extent be clipped to the input extent: this option removes unwanted pixels created on borders by blurring.

Figuur 17.12. Example

Example

Right-up corner of the image, zoom x800

Example

Clip to the input extent unchecked

Example

Clip to the input extent checked


The Gaussian Blur filter doesn't preserve edges in the image. See