| Keyboard Shortcut | Menu Shortcut | Menu Location |
| G | Alt+R, G | Raster -> Gaussian Blur |
The Gaussian Blur command blurs the image by calculating a weighted average of each pixel and its neighbors.

Smooth Level
Increasing the smooth level increases the amount of blur in the resulting image.
3x3
Calculates the weighted average of a 3x3 group of pixels centered on the pixel being adjusted.
5x5
Calculates the weighted average of a 5x5 group of pixels centered on the pixel being adjusted.
7x7
Calculates the weighted average of a 7x7 group of pixels centered on the pixel being adjusted.
Enable Real-time Preview
Check this box to preview the results of the changed settings.