Figure 11.153.
The same image, before and after applying Fractal Explorer filter
13.14.2.
Starting filter
This filter is found in
Filters → Render → Nature → Fractal Explorer
13.14.3.
Options
Figure 11.154.
"Parameters" options for Fractal Explorer filter
Preview domain
Uncheck the Real time preview only if your
computer is slow. In this case, you can update preview by
clicking on the Redraw button.
By clicking-dragging mouse pointer on preview, you can draw a
rectangle delimiting an area which will be zoomed.
Zoom
You have there some options to zoom in or zoom out. The
Undo allows you to return to previous
state, before zooming. The Redo allows
you to restablish the zoom you had undone, without having to
re-create it with the zoom-in button.
Parameters tab
This tab contains some options to set fractal calculation and
select fractal type.
Fractal Parameters
here, you have sliders and input boxes to set fractal
spreading, repetition and aspect.
XMIN; XMAX; YMIN; YMAX
You can set fractal spreading betwwen a MINimum and
a MAXimum, in the horizontal (X) and/or vertical (Y)
directions. Values are from -3.0 to 3.0.
ITER
With this parameter, you can set fractal iteration,
repetition and so detail. Values are from 0.0 to
1000.0
CX; CY
With these parameters, you can change fractal
aspect, in the horizontal (X) and/or vertical (Y)
directions, except for Mandelbrot and Sierpinski
types.
Open; Reset; Save
With these three buttons, you can save your work
with all its parameters, open a previouly saved
fractal, or return to the initial state before all
modifications.
Fractal type
You can choose what fractal type will be, for instance
Mandelbrot, Julia,
Barnsley ou
Sierpinski
Colors tab
Figure 11.155.
Color tab options
This tab contains options for fractal color setting.
Color number
This slider and its input boxes allow you to set the
number of colors for the fractal, between 2 and 8192.
A palette of these colors is displayed at he bottom of
the tab. Actually, that's a gradient between colors in
fractal: you can change colors with “Color intensity
” and “Color function ” options.
Fractal colors don't depend on colors of the original
image (you can use a white image for fractals as well).
Use loglog-smoothing
Figure 11.156.
Loglog smoothing example
Color density
These three sliders and their inputboxes allow you to set
color intensity in the three
Red, Green and
Blue color channels. Values vary from
0.0 to 1.0.
Color function
For the Red,
Green and Blue
color channels, you can select how color will be treated:
Sinus: Color variations will be
modulated according to the sinus function.
Cosinus: Color densities will
vary according to cosinus function.
None: Color densities will vary
linearly.
Inversion: if you check this
option, higher color values will be swapped with lower
ones and vice-versa.
Color Mode
These options allow you to set where color values must be
taken.
Apply active gradient to final image
: used colors will be that of active
gradient. You should be able to select another gradient
by clicking on the gradient source button.
Fractals tab
Figure 11.157.
“Fractal tab” options
This tab contains a big list of fractals with their parameters,
that you can use as a model: only click on the wanted one.
The Refresh allows you to update the
list if you have saved your work, without needing to re-start
Gimp. You can delete the selected fractal from the list by
clicking on the Delete.
