User Guide

GNU Image Manipulation Program
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Figure 15.183: ‘Brush’ tab options
"Brush" is a general term for any material used to paint. A list of brushes is available with a Preview for the selected one.
Gamma Changes the gamma (luminosity) of the selected brush. The gamma correction brightens or darkens midtones.
Select You can also use a brush pattern you have created by selecting its image (arrow button on the Select line). This
image must be on your screen before you launch the filter to be taken in account. Of course, don’t use big images.
If your image has several layers, they also will be displayed in the Select list and can be used as a brush. When
selected, the layer appears in the brush preview and the normal brush is deselected.
The Save as button allows you to save the selected brush.
Aspect ratio Specifies the brush proportions, height (0 -1) and width (0 +1).
Relief Specifies the amount of paint used for each stroke. This may evoke painting with a palette knife.
Orientation tab
Figure 15.184: ‘Orientation’ tab options
This tab allows to set the orientation of the brush strokes. A painter is not obliged to go over with the same paintbrush
angle. To perform some effects, he can vary their orientation.
Directions With this option, you can set how many times the brush will pass through a same place, with each time a
different direction, resulting in a more and more thick paint.
Start Angle Specifies the general direction of the strokes, the angle that the angle range will start from. Directions are
often choosen to give some movement to the image.
Angle Span Specifies the angle, the sector, of the stroke "fan".