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- <th colspan="3" align="center">8.18. 
- <span lang="en" xml:lang="en">Whirl and Pinch</span>
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- <th width="60%" align="center">8. 
- <span lang="en" xml:lang="en">Distort Filters</span>
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- <h3 class="title"><a id="plug-in-whirl-pinch"></a>8.18. 
- <span lang="en" xml:lang="en">Whirl and Pinch</span>
- </h3>
- </div>
- </div>
- </div>
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- <div>
- <div>
- <h4 class="title"><a id="id2756300"></a>8.18.1. 
- <span lang="en" xml:lang="en">Overview</span>
- </h4>
- </div>
- </div>
- </div>
- <div class="figure">
- <a id="id2756311"></a>
- <p class="title">
- <b>Figure 16.152. 
- <span lang="en" xml:lang="en">Example for the Whirl and Pinch filter</span>
- </b>
- </p>
- <div class="figure-contents">
- <div class="mediaobject">
- <img src="../images/filters/examples/taj_orig.jpg" alt="Example for the Whirl and Pinch filter" />
- <div class="caption">
- <p>Original image</p>
- </div>
- </div>
- <div class="mediaobject">
- <img src="../images/filters/examples/distort-taj-whirlpinch.jpg" alt="Example for the Whirl and Pinch filter" />
- <div class="caption">
- <p>Filter applied</p>
- </div>
- </div>
- </div>
- </div>
- <br class="figure-break" />
- <p>
- You can find this filter through
- <span class="guimenu">Filters</span> ‚Üí <span class="guisubmenu">Distorts</span> ‚Üí <span class="guimenuitem">W<span class="accel">h</span>irl and Pinch</span>
- </p>
- <p>
- "Whirl and Pinch" distorts your image in a concentric way.
- </p>
- <p>
- "Whirl" distorts the image much like the little whirlpool that
- appears when you empty your bath.
- </p>
- <p>
- "Pinch" can be compared to applying your image to a soft rubber
- surface and squeezing the edges or corners. If the Pinch amount
- slider is set to a negative value, it will look as if someone
- tried to push a round object up toward you from behind the
- rubber skin. If the Pinch amount is set to a positive value, it
- looks like someone is dragging or sucking on the surface from
- behind, and away from you.
- </p>
- <div class="tip" style="margin-left: 0.5in; margin-right: 0.5in;">
- <table border="0" summary="Tip">
- <tr>
- <td rowspan="2" align="center" valign="top" width="25">
- <img alt="[Tip]" src="../images/tip.png" />
- </td>
- <th align="left">Tip</th>
- </tr>
- <tr>
- <td align="left" valign="top">
- <p>
- The “<span class="quote">pinch</span>” effect can sometimes be used to compensate
- for image distortion produced by telephoto or fisheye lenses
- (“<span class="quote">barrel distortion</span>”).
- </p>
- </td>
- </tr>
- </table>
- </div>
- <div class="figure">
- <a id="id2756455"></a>
- <p class="title">
- <b>Figure 16.153. 
- <span lang="en" xml:lang="en">Illustration</span>
- </b>
- </p>
- <div class="figure-contents">
- <div class="mediaobject">
- <img src="../images/filters/examples/whirlpinch-orig.png" alt="Illustration" />
- <div class="caption">
- <p>Original</p>
- </div>
- </div>
- <div class="mediaobject">
- <img src="../images/filters/examples/whirlpinch-whirl.png" alt="Illustration" />
- <div class="caption">
- <p>Whirled</p>
- <p>Remolino</p>
- </div>
- </div>
- <div class="mediaobject">
- <img src="../images/filters/examples/whirlpinch-pinch.png" alt="Illustration" />
- <div class="caption">
- <p>Pinched</p>
- </div>
- </div>
- </div>
- </div>
- <br class="figure-break" />
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- <div class="sect3" lang="en" xml:lang="en">
- <div class="titlepage">
- <div>
- <div>
- <h4 class="title"><a id="id2756546"></a>8.18.2. 
- <span lang="en" xml:lang="en">Parameter Settings</span>
- </h4>
- </div>
- </div>
- </div>
- <div class="figure">
- <a id="id2756557"></a>
- <p class="title">
- <b>Figure 16.154. 
- <span lang="en" xml:lang="en">
- “<span class="quote">Whirl and Pinch</span>” filter options
- </span>
- </b>
- </p>
- <div class="figure-contents">
- <div class="mediaobject">
- <img src="../images/filters/filters-distort-whirlpinch.png" alt="Whirl and Pinch filter options" />
- </div>
- </div>
- </div>
- <br class="figure-break" />
- <div class="variablelist">
- <dl>
- <dt>
- <span class="term">Preview</span>
- </dt>
- <dd>
- <p>
- Changes to parameters are immediately displayed into the
- <span class="emphasis"><em>Preview</em></span>. The whirlpool is focused around the
- center of the current layer or selection.
- </p>
- </dd>
- <dt>
- <span class="term">Whirl Angle</span>
- </dt>
- <dd>
- <p>
- <span class="guilabel">Whirl Angle</span>: Clockwise or counter
- clockwise (-360 to +360). Controls how many degrees the
- affected part of the image is rotated.
- </p>
- </dd>
- <dt>
- <span class="term">Pinch Amount</span>
- </dt>
- <dd>
- <p>
- <span class="guilabel">Pinch Amount</span>: Whirlpool depth(-1 to
- +1). Determines how strongly the affected part of the
- image is pinched.
- </p>
- </dd>
- <dt>
- <span class="term">Radius</span>
- </dt>
- <dd>
- <p>
- <span class="guilabel">Radius</span>: Whirlpool width (0.0-2.0).
- Determines how much of the image is affected by the
- distortion. If you set <em class="parameter"><code>Radius</code></em> to
- 2, the entire image will be affected. If you set
- <em class="parameter"><code>Radius</code></em> to 1, half the image will
- be affected. If <em class="parameter"><code>Radius</code></em> is set to 0,
- nothing will be
- affected (think of it as the radius in a circle with 0 in
- the center and 1 halfway out).
- </p>
- </dd>
- </dl>
- </div>
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