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<h3 class="title"><a id="plug-in-gradmap"></a>3.9. Gradient Map</h3>
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<img src="../images/filters/examples/gradmap-example.png" />
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Example of Gradient Mapping. Top: Original image. Middle: a
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gradient. Bottom: result of applying the gradient to the
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original image with the Gradient Map filter.
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This filter uses the current gradient, as shown in the
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Brush/Pattern/Gradient area of the Toolbox, to recolor the active
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layer or selection of the image to which the filter is applied. To
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use it, first choose a gradient from the <a href="ch04s12.html" title="12. Gradients dialog">Gradients Dialog</a>. Then
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select the part of the image you want to alter, and activate the
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<span class="guimenu">Filters</span>-><span class="guisubmenu">Colors</span>-><span class="guisubmenu">Map</span>-><span class="guimenuitem">Gradient Map</span>
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from the image menu. The filter runs automatically, without
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showing any dialog or requiring any further input. It uses image
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color intensities (0 - 255), mapping the darkest pixels to
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the left end color from the gradient, and the lightest pixels to
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the right end color from the gradient. Intermediate values are set
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to the corresponding intermediate colors.
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