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<?xml version="1.0" encoding="UTF-8" standalone="no"?>
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<title>9.3. Gflare</title>
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<th colspan="3" align="center" id="chaptername">9.3. Gflare</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-Gflare"></a>9.3. Gflare</h3>
</div>
</div>
</div>
<a id="id3364769" class="indexterm"></a>
<div class="mediaobject">
<img src="../images/filters/filters-light-gflare.png" />
</div>
<div class="simplesect" lang="en" xml:lang="en">
<div class="titlepage">
<div>
<div>
<h4 class="title"><a id="id3364541"></a>Overview</h4>
</div>
</div>
</div>
<p>
This filter is found in
<span class="guimenuitem">Image>Filters/Light Effects/<span class="accel">G</span>flare</span>.
</p>
<p>
Gflare effect reminds the effect you get when you take a photograph of a blinding
light source, with a halo and radiations around the source. The Gflare image has
three components: <span class="emphasis"><em>Glow</em></span> which is the big central fireball,
<span class="emphasis"><em>Rays</em></span> and
<span class="emphasis"><em>Second Flares</em></span>
</p>
</div>
<div class="simplesect" lang="en" xml:lang="en">
<div class="titlepage">
<div>
<div>
<h4 class="title"><a id="id3364908"></a>Preview</h4>
</div>
</div>
</div>
<p>
When <span class="guilabel">Auto Update Preview</span> is checked, parameter setting results are
interactively displayed in preview without modifying the image until you click on
<span class="guilabel">OK</span> button.
</p>
</div>
<div class="simplesect" lang="en" xml:lang="en">
<div class="titlepage">
<div>
<div>
<h4 class="title"><a id="id3364962"></a>Settings</h4>
</div>
</div>
</div>
<p>
The Settings tab allows you to set manually the parameters while the Selector tab let you
choose presets in a list.
</p>
<p>
<span class="guilabel">Center</span>: You can set there X and Y (pixels) coordinates of glint.
The coordinate origin is at upper left corner
</p>
<p>
<span class="guilabel">Radius</span>: The radius of the effect. Don't be affraid to use the box with the
digits instead the slider a bit limited.
</p>
<p>
<span class="guilabel">Rotation</span>: Turn the effect.
</p>
<p>
<span class="guilabel">Hue Rotation</span>: Change the tint (color) of the effect.
</p>
<p>
<span class="guilabel">Vector Angle</span>: Turn the Second flares.
</p>
<p>
<span class="guilabel">Vector length</span>: Vary the distance applied for the Second flares.
</p>
<p>
<span class="guilabel">Adaptive Supesampling</span>: Settings of the antialiasing following parametres
like Depth and Threshold.
</p>
</div>
<div class="simplesect" lang="en" xml:lang="en">
<div class="titlepage">
<div>
<div>
<h4 class="title"><a id="id3365096"></a>Selector</h4>
</div>
</div>
</div>
<p>
The Selector tab allows you to select a Gflare pattern, to change it and save it.
</p>
<div class="variablelist">
<dl>
<dt>
<span class="term">New</span>
</dt>
<dd>
<p>
When you click on this button, you open the selected Gflare pattern and you can use it
to create a new one with a new name.
</p>
</dd>
<dt>
<span class="term">Edit</span>
</dt>
<dd>
<p>
This button brings up the Gflare Editor (see below).
</p>
</dd>
<dt>
<span class="term">Copy</span>
</dt>
<dd>
<p>
This button allows you to save the modified Glare pattern, renaming it.
</p>
</dd>
<dt>
<span class="term">Delete</span>
</dt>
<dd>
<p>
This button deletes the selected Gflare pattern.
</p>
</dd>
</dl>
</div>
</div>
<div class="simplesect" lang="en" xml:lang="en">
<div class="titlepage">
<div>
<div>
<h4 class="title"><a id="id3365175"></a>Gflare Editor</h4>
</div>
</div>
</div>
<div class="mediaobject">
<img src="../images/filters/filters-light-gflare-editor.png" />
</div>
<div class="variablelist">
<dl>
<dt>
<span class="term">General</span>
</dt>
<dd>
<p><b>Glow Paint Options. </b>
</p>
<div class="orderedlist">
<ol type="1">
<li>
<p>
<span class="guilabel">Opacity</span>: Slider and input box give more opacity
to glow (0-100).
</p>
</li>
<li>
<p>
<span class="guilabel">Paint Mode</span>: You can choose between four modes:
</p>
<div class="itemizedlist">
<ul type="disc">
<li>
<p>
<span class="emphasis"><em>Normal</em></span>: In this mode, the glow covers
the image without taking
into account what is beneath.
</p>
</li>
<li>
<p>
<span class="emphasis"><em>Addition</em></span>: Pixel RGB values of glow are
added to RGB values of the corresponding pixels in the image.
Colors get lighter and white areas may appear.
</p>
</li>
<li>
<p>
<span class="emphasis"><em>Overlay</em></span>: Light/Dark areas of glow enhance
corresponding light/dark areas of image.
</p>
</li>
<li>
<p>
<span class="emphasis"><em>Screen</em></span>: Dark areas of image are enlightened
by corresponding light areas of glow. Imagin two slides projected
onto the same screen.
</p>
</li>
</ul>
</div>
</li>
</ol>
</div>
<p>
</p>
<p><b>Rays Paint Options. </b>
Options are the same as for "Glow".
</p>
<p><b>Second Flare Paint Options. </b>
Options are the same as for "Glow".
</p>
</dd>
<dt>
<span class="term">Glow</span>
</dt>
<dd>
<p><b>Gradients. </b>
</p>
<div class="orderedlist">
<ol type="1">
<li>
<p>
By clicking on the rectangular buttons, you can develop a long list
of gradients. "%" gradients belong to the Editor.
</p>
</li>
<li>
<p>
<span class="guilabel">Radial gradient</span>: The selected gradient is drawn radially,
from center to edge.
</p>
</li>
<li>
<p>
<span class="guilabel">Angular gradient</span>: The selected gradient develops around
center, counter-clockwise, starting from three o'clock if "Rotation" parameter
is set to 0. Radial and angular gradients are combined according to the
Multiply mode: light areas are enhanced and colors are mixed according to CMYK
color system (that of your printer).
</p>
</li>
<li>
<p>
<span class="guilabel">Angular size gradient</span>: This is a gradient of radius
size which develops angularly. Radius is controled according to gradient
Luminosity: if luminosity is zero (black), the radius is 0%. If luminosity
is 100% (white), the radius is also 100%.
</p>
</li>
</ol>
</div>
<p>
</p>
<p><b>Parameters. </b>
</p>
<div class="orderedlist">
<ol type="1">
<li>
<p>
<span class="guilabel">Size (%)</span>: Sets size (%) of glow (0-200).
</p>
</li>
<li>
<p>
<span class="guilabel">Rotation</span>: Sets the origin of the angular
gradient (-180 +180).
</p>
</li>
<li>
<p>
<span class="guilabel">Hue rotation</span>: Sets glow color, according to the HSV color
circle (-180 +180).
</p>
</li>
</ol>
</div>
<p>
</p>
</dd>
<dt>
<span class="term">Rays</span>
</dt>
<dd>
<p><b>Gradients. </b>
</p>
<div class="orderedlist">
<ol type="1">
<li>
<p>
The options are the same as for Glow.
</p>
</li>
</ol>
</div>
<p>
</p>
<p><b>Parameters. </b>
</p>
<div class="orderedlist">
<ol type="1">
<li>
<p>
The first three options are the same as in Glow. Two are new:
</p>
</li>
<li>
<p>
<span class="guilabel"># of spikes</span>:This option determines the
number of spikes (1-300)
but also their texture.
</p>
</li>
<li>
<p>
<span class="guilabel">Spike Thickness</span>: When spikes get wider (1-100),
they look like flower petals
</p>
</li>
</ol>
</div>
<p>
</p>
</dd>
<dt>
<span class="term">Second Flares</span>
</dt>
<dd>
<p><b>Gradients. </b>
The options are the same as for Glow.
</p>
<p><b>Parameters. </b>
Options are the same as in Glow.
</p>
<p><b>Shape of Second Flares. </b>
Second flares, these satellites of the main flare, may have two shapes:
<span class="emphasis"><em>Circle</em></span> and <span class="emphasis"><em>Polygon</em></span>. You can set the
<span class="emphasis"><em>Number</em></span> polygon sides. The option accepts 1 side (!), not 2.
</p>
<p><b>Random seed and Randomize. </b>
</p>
<div class="orderedlist">
<ol type="1">
<li>
<p>
<span class="guilabel">Random Seed</span>: The random generator will use
this value as a seed to generate random numbers. You can use the same
value to repeat the same "random" sequence several times.
</p>
</li>
<li>
<p>
<span class="guilabel">Randomize</span>: When you click on this button, you
produce a random seed that will be used by the random generator.
It is each time different.
</p>
</li>
</ol>
</div>
<p>
</p>
</dd>
</dl>
</div>
</div>
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