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<th colspan="3" align="center" id="chaptername">12.4. Flame</th>
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<div class="sect2" lang="en" xml:lang="en">
<div class="titlepage">
<div>
<div>
<h3 class="title"><a id="plug-in-flame"></a>12.4. Flame</h3>
</div>
</div>
</div>
<a id="id3372164" class="indexterm"></a>
<div class="mediaobject">
<img src="../images/filters/filters-render-flame.png" />
</div>
<div class="simplesect" lang="en" xml:lang="en">
<div class="titlepage">
<div>
<div>
<h4 class="title"><a id="id3372105"></a>Overview</h4>
</div>
</div>
</div>
<div class="informalfigure">
<div class="mediaobject">
<img src="../images/filters/examples/flame1.png" />
<div class="caption">
<p>
Example of a rendered Flame.
</p>
</div>
</div>
</div>
<p>
This filter is found in
<span class="guimenuitem">Image>Filters/Render/Nature/<span class="accel">F</span>lame</span>
</p>
<p>
With the Flame filter, you can create stunning, randomly
generated fractal patterns. You can't control the fractals as
you can with the <a href="ch06s12s05.html" title="12.5. IFS Compose">Ifs
Compose</a> filter, but you can steer the
random generator in a certain direction, and choose from
variations of a theme you like.
</p>
<p>
In the main window, you can set Rendering and Camera
parameters. The first three parameters in the Render display are
Brightness, Contrast and Gamma. The result of these options is
visible in the Preview window, but it's generally better to
stick to the default values, and correct the rendered image
later with Image/Colors.
</p>
<p>
The other three parameters affect the rendering process and
don't show in the preview window. Sample Density, which controls
the resolution of the rendered pattern, is the most important of
these. The Camera parameters allow
you to zoom and offset the flame pattern, until you're happy
with what you see in the preview window. Flame also offers the
possibility to store and load your favorite patterns.
</p>
</div>
<div class="simplesect" lang="en" xml:lang="en">
<div class="titlepage">
<div>
<div>
<h4 class="title"><a id="id3372394"></a>Options</h4>
</div>
</div>
</div>
<div class="variablelist">
<dl>
<dt>
<span class="term">Edit</span>
</dt>
<dd>
<div class="informalfigure">
<div class="mediaobject">
<img src="../images/filters/filters-render-flame-edit.png" />
<div class="caption">
<p>
The Edit Flame dialog
</p>
</div>
</div>
</div>
<p>
Pressing this button brings up the Edit dialog. The
dialog shows nine different windows. The pattern displayed
in the center is the current pattern, and the eight
windows surrounding it are random variations of that
pattern. Clicking on the central image creates eight new
variations, which can be adjusted with the Speed
control. You select a variation by clicking on it, and it
instantly replaces the image in the middle. To pick a
certain character or theme for the variations, you can
choose from nine different themes in the Variations
menu. You can also use Randomize, which replaces the
current pattern with a new random pattern.
</p>
</dd>
<dt>
<span class="term">Open</span>
</dt>
<dd>
<p>
This button brings up a file selector that allow you to
open a previously saved Flame settings file.
</p>
</dd>
<dt>
<span class="term">Save</span>
</dt>
<dd>
<p>
This button brings up a file save dialog that allows you
to save the current settings for the plug-in, so that you
can recreate them later.
</p>
</dd>
<dt>
<span class="term">Rendering: Brightness</span>
</dt>
<dd>
<p>
Controls the brightness of the flame object.
</p>
</dd>
<dt>
<span class="term">Rendering: Contrast</span>
</dt>
<dd>
<p>
Controls the contrast between brighter and dimmer parts of
the flame.
</p>
</dd>
<dt>
<span class="term">Rendering: Gamma</span>
</dt>
<dd>
<p>
Sets a gamma correction for parts with intermediate
brightness.
</p>
</dd>
<dt>
<span class="term">Rendering: Sample Density</span>
</dt>
<dd>
<p>
Controls the resolution of the rendered pattern. (Does
not have any effect on the preview.) A high sample
density results in soft and smooth
rendering (like a spider's web), whereas low density
rendering resembles spray or particle clouds.
</p>
</dd>
<dt>
<span class="term">Rendering: Spatial Oversample</span>
</dt>
<dd>
<p>
What does this do?
</p>
</dd>
<dt>
<span class="term">Rendering: Spatial Filter Radius</span>
</dt>
<dd>
<p>
What does this do?
</p>
</dd>
<dt>
<span class="term">Rendering: Colormap</span>
</dt>
<dd>
<p>
This menu gives you several options to set the color blend
in the flame pattern:
</p>
<div class="itemizedlist">
<ul type="disc">
<li>
<p>
The current gradient as shown in the Toolbox.
</p>
</li>
<li>
<p>
A number of preset colormaps.
</p>
</li>
<li>
<p>
The colors from images that are presently open in
Gimp.
</p>
</li>
</ul>
</div>
</dd>
<dt>
<span class="term">Camera: Zoom</span>
</dt>
<dd>
<p>
Allows you to zoom the flame in or out.
</p>
</dd>
<dt>
<span class="term">Camera: X, Y</span>
</dt>
<dd>
<p>
Allows you to move the flame around in the image area.
</p>
</dd>
</dl>
</div>
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