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<h3 class="title"><a id="plug-in-sparkle"></a>9.5. Sparkle</h3>
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<a id="id2978525" class="indexterm"></a>
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<img src="../images/filters/filters-light-sparkle.png" />
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<h4 class="title"><a id="id2978546"></a>Overview</h4>
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This filter is found in
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<span class="guimenuitem">Image>Filters/Light Effects/Sparkle</span>.
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This filter adds sparkles to your image. It uses the lightest points according to a threshold
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you have determined. It is difficult to foresee where sparkles will appear. But you can put
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white points on your image where you want sparkles to be.
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<div class="simplesect" lang="en" xml:lang="en">
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<div class="titlepage">
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<h4 class="title"><a id="id2978575"></a>Parameter Settings</h4>
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Sliders and input boxes allow you to set values.
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<div class="variablelist">
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<span class="term">Luminosity Threshold</span>
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The higher the threshold, the more areas are concerned by sparkling (0.0-0.1).
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<span class="term">Flare Intensity</span>
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When this value increases, the central spot and rays widen (0.0-1.0).
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<span class="term">Spike Length</span>
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This is ray length (1-100). When you reduce it, small spikes decrease first.
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<span class="term">Spike Points</span>
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Number of starting points for spikes (0-16). It's the number of big spikes. There is the same
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number of small spikes. When number is odd, small spikes are opposite the big ones. When number
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is even, big spikes are opposite another big spike.
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<span class="term">Spike Angle</span>
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This is angle of first big spike with horizontal (-1 +360). -1 determines this value at random.
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If a spot has several pixels within required threshold, each of them will generate a sparkle.
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If angle is positive, they will all be superimposed. With -1, each sparkle will have a random
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rotation resulting in numerous thin spikes.
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<span class="term">Spike Density</span>
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This option determines the number of sparkles on your image. It indicates the percentage
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(0.0-1.0) of all possible sparkles that will be preserved.
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<span class="term">Opacity</span>
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When you decrease Opacity (0.0-1.0), sparkles become more transparent and the layer beneath
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becomes visible. If there is no other layer, sparkle saturation decreases.
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<span class="term">Random Hue</span>
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This option should change sparkle hue at random... (0.0-1.0)
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<span class="term">Random Saturation</span>
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This option should change sparkle saturation at random... (0.0-1.0)
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<span class="term">Preserve Luminosity</span>
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Gives to all central pixels the luminosity of the brightest pixel, resulting in increasing
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the whole sparkle luminosity.
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<span class="term">Inverse</span>
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Instead of selecting brightest pixels in image, Sparkle will select the darkest ones, resulting
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<span class="term">Add Border</span>
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Instead of creating sparkles on brightest pixels, this option creates an image border made up of
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<span class="term">Random Hue</span>
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This option should change sparkle hue at random...
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<span class="term">Colors</span>
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You can change there the color of central pixels. This color will be added in Screen mode
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(Multiply if Preserve is checked).
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