User Guide

GNU Image Manipulation Program
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Spatial Transformation Gives you information on the active fractal, and allows you to type a value instead of changing it
manually. Changing parameters with the mouse isn’t very accurate, so this is a useful option when you need to be exact.
Color transformation
Figure 15.247: ‘Color transformation’ tab options
Simple color transformation Changes the color of the currently selected fractal component (default is the foreground
color in the toolbox) to a color of your choice.
Full color transformation Like the Simple color transformation but this time you can manage the color transformation
for each color channel and for the alpha channel (shown as a black channel).
Scale Hue/Value When you have many fractals with different colors, the colors blend into each other. So even if you set
‘pure red’ for a fractal, it might actually be quite blue in some places, while another ‘red ’ fractal might have a lot
of yellow in it. Scale Hue/Value changes the color strength of the active fractal, or how influential that fractal color
should be.
Relative Probability Determines influence or total impact of a certain fractal.
15.13.5.3 A Brief Tutorial
This is a rather complex plug-in, so to help you understand it, we’ll guide you through an example where you’ll create a leaf or
branch.
Many forms of life, and especially plants, are built like mathematical fractals, i.e., a shape that reproduces or repeats itself
indefinitely into the smallest detail. You can easily reproduce the shape of a leaf or a branch by using four (or more) fractals.
Three fractals make up the tip and sides of the leaf, and the fourth represents the stem.
1. Before invoking the filter: Select File → New Image Add a transparent layer with Layers → Layers and Channels → New
Layer Set the foreground color in the toolbox to black, and set the background to white.
2. Open IFS Compose. Start by rotating the right and bottom triangles, so that they point upward. You’ll now be able to see
the outline of what’s going to be the tip and sides of the leaf. (If you have problems, it may help to know that the three
vertices of a triangle are not equivalent.)