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<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN">
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<title>paintlib: PLFilterContrast class Reference</title>
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<h1>PLFilterContrast Class Reference</h1><code>#include <<a class="el" href="plfiltercontrast_8h-source.html">plfiltercontrast.h</a>></code>
<p>
<p>Inheritance diagram for PLFilterContrast:
<p><center><img src="classPLFilterContrast.png" usemap="#PLFilterContrast_map" border="0" alt=""></center>
<map name="PLFilterContrast_map">
<area href="classPLFilter.html" alt="PLFilter" shape="rect" coords="0,56,103,80">
</map>
<a href="classPLFilterContrast-members.html">List of all members.</a><table border=0 cellpadding=0 cellspacing=0>
<tr><td></td></tr>
<tr><td colspan=2><br><h2>Public Member Functions</h2></td></tr>
<tr><td class="memItemLeft" nowrap align=right valign=top> </td><td class="memItemRight" valign=bottom><a class="el" href="classPLFilterContrast.html#a0">PLFilterContrast</a> (double contrast, PLBYTE offset)</td></tr>
<tr><td class="memItemLeft" nowrap align=right valign=top>virtual void </td><td class="memItemRight" valign=bottom><a class="el" href="classPLFilterContrast.html#a2">Apply</a> (<a class="el" href="classPLBmpBase.html">PLBmpBase</a> *pBmpSource, <a class="el" href="classPLBmp.html">PLBmp</a> *pBmpDest) const</td></tr>
<tr><td colspan=2><br><h2>Protected Attributes</h2></td></tr>
<tr><td class="memItemLeft" nowrap align=right valign=top><a name="p0" doxytag="PLFilterContrast::m_contrast"></a>
double </td><td class="memItemRight" valign=bottom><b>m_contrast</b></td></tr>
<tr><td class="memItemLeft" nowrap align=right valign=top><a name="p1" doxytag="PLFilterContrast::m_offset"></a>
double </td><td class="memItemRight" valign=bottom><b>m_offset</b></td></tr>
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<hr><a name="_details"></a><h2>Detailed Description</h2>
Enhances or reduces the image contrast using a linear mapping between input and output. The zero point (i. e., the intensity that is neither enhanced nor reduced) has to be provided. (A Contrast filter is defined in the following way: It lowers all intensity values below a given threshold, and it raises them beyond. Most applications position the threshold at 50 . This does not always yield the best results, especially if you have an unbalanced dark/light ratio of pixels. The best you can do here is play around with the threshold.) Works for 24 and 32 bpp bitmaps.
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<p>
Definition at line <a class="el" href="plfiltercontrast_8h-source.html#l00033">33</a> of file <a class="el" href="plfiltercontrast_8h-source.html">plfiltercontrast.h</a>.<hr><h2>Constructor & Destructor Documentation</h2>
<a name="a0" doxytag="PLFilterContrast::PLFilterContrast"></a><p>
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<td class="md" nowrap valign="top"> PLFilterContrast::PLFilterContrast </td>
<td class="md" valign="top">( </td>
<td class="md" nowrap valign="top">double </td>
<td class="mdname" nowrap> <em>contrast</em>, </td>
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<td></td>
<td></td>
<td class="md" nowrap>PLBYTE </td>
<td class="mdname" nowrap> <em>offset</em></td>
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<td class="md">) </td>
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<p>
contrast is the slope of the function. offset is the intensity at which the color stays the same. Above this value, intensities are increased. Below it, they are reduced. With offset 128 and contrast 1, the image stays unchanged. </td>
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<hr><h2>Member Function Documentation</h2>
<a name="a2" doxytag="PLFilterContrast::Apply"></a><p>
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<td class="md" nowrap valign="top"> virtual void PLFilterContrast::Apply </td>
<td class="md" valign="top">( </td>
<td class="md" nowrap valign="top"><a class="el" href="classPLBmpBase.html">PLBmpBase</a> * </td>
<td class="mdname" nowrap> <em>pBmpSource</em>, </td>
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<td></td>
<td></td>
<td class="md" nowrap><a class="el" href="classPLBmp.html">PLBmp</a> * </td>
<td class="mdname" nowrap> <em>pBmpDest</em></td>
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<td></td>
<td class="md">) </td>
<td class="md" colspan="2"> const<code> [virtual]</code></td>
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<p>
Applies the Filter to pBmpSource and stores the result in pBmpDest. The base-class version copies the bitmap before calling ApplyInPlace (pBmpDest).
<p>
Reimplemented from <a class="el" href="classPLFilter.html#a3">PLFilter</a>. </td>
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<hr>The documentation for this class was generated from the following file:<ul>
<li><a class="el" href="plfiltercontrast_8h-source.html">plfiltercontrast.h</a></ul>
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