User Guide

GNU Image Manipulation Program
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Figure 15.221: With a complex gradient:
And a complex gradient, such as the Solid Noise filter can create, gives a swirl effect.
This filter offers the possibility of masking a part of the image to protect it against filter action.
15.12.11.2 Options
Figure 15.222: Warp filter options
BASIC OPTIONS
Step Size ‘Step’ is displacement distance for every filter iteration. A 10 value is necessary to get a one pixel displacement. This
value can be negative to invert displacement direction.
Iterations Iteration is the number of repetitions of effect when applying filter.
On Edges Because of displacement, a part of pixels are driven over the borders of layer or selection, and, on the opposite side,
pixels places are emptying. Four following options allow you to fix this issue:
• Warp (default): What goes out on one side is going into the opposite side.
• Smear: Emptying places are filled with a spreading of the neighbouring image line.
• Black : Emptying places are filled with black color.
• FG Color : Emptying places are filled with the Foreground color of the color area in Toolbox.
Displacement Map To be listed in this drop-down list, the displacement map, which is a grey-scaled image, must be present on
your screen when you call filter and must have the same size as the original image.
ADVANCED OPTIONS