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<h3 class="title"><a id="plug-in-apply_lens"></a>8.2. Apply Lens</h3>
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This filter is found in
<span class="guimenuitem">Image>Filters/glass-effects/Apply <span class="accel">L</span>ens</span>
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After applying this filter, a part of the image is rendered as through a spherical lens.
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<span class="term">Parameter settings</span>
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<span class="guilabel">Keep original surrounding</span>: The lens seems to be put on the
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<span class="guilabel">Set surroundings to Background color</span>: The part of the image
outside the lens will have the Background color selected in Toolbox. This can
be a transparent background.
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<span class="guilabel">Lens Refraction Index</span>: Lens will be more or less convergent (1-100).
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