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<h1>plfiltercontrast.h</h1><div class="fragment"><pre>00001 <span class="comment">/*</span>
00002 <span class="comment">/--------------------------------------------------------------------</span>
00003 <span class="comment">|</span>
00004 <span class="comment">| $Id: plfiltercontrast_8h-source.html,v 1.4 2004/09/15 15:26:29 uzadow Exp $</span>
00005 <span class="comment">|</span>
00006 <span class="comment">| Copyright (c) 1996-2002 Ulrich von Zadow</span>
00007 <span class="comment">|</span>
00008 <span class="comment">\--------------------------------------------------------------------</span>
00009 <span class="comment">*/</span>
00010
00011 <span class="preprocessor">#if !defined(INCL_PLFILTERCONTRAST)</span>
00012 <span class="preprocessor"></span><span class="preprocessor">#define INCL_PLFILTERCONTRAST</span>
00013 <span class="preprocessor"></span>
00014 <span class="preprocessor">#if _MSC_VER > 1000</span>
00015 <span class="preprocessor"></span><span class="preprocessor">#pragma once</span>
00016 <span class="preprocessor"></span><span class="preprocessor">#endif // _MSC_VER > 1000</span>
00017 <span class="preprocessor"></span>
00018 <span class="preprocessor">#include "plfilter.h"</span>
00019 <span class="preprocessor">#include "<a class="code" href="plpaintlibdefs_8h.html">plpaintlibdefs.h</a>"</span>
00020
00021 <span class="keyword">class </span><a class="code" href="classPLBmp.html">PLBmp</a>;
00022 <span class="comment"></span>
00023 <span class="comment">//! Enhances or reduces the image contrast using a linear mapping</span>
00024 <span class="comment">//! between input and output. The zero point (i. e., the intensity</span>
00025 <span class="comment">//! that is neither enhanced nor reduced) has to be provided.</span>
00026 <span class="comment">//! (A Contrast filter is defined in the following way: It lowers all</span>
00027 <span class="comment">//! intensity values below a given threshold, and it raises them</span>
00028 <span class="comment">//! beyond. Most applications position the threshold at 50 %. This</span>
00029 <span class="comment">//! does not always yield the best results, especially if you have an</span>
00030 <span class="comment">//! unbalanced dark/light ratio of pixels. The best you can do here</span>
00031 <span class="comment">//! is play around with the threshold.)</span>
00032 <span class="comment">//! Works for 24 and 32 bpp bitmaps.</span>
<a name="l00033"></a><a class="code" href="classPLFilterContrast.html">00033</a> <span class="comment"></span><span class="keyword">class </span><a class="code" href="classPLFilterContrast.html">PLFilterContrast</a> : <span class="keyword">public</span> <a class="code" href="classPLFilter.html">PLFilter</a>
00034 {
00035 <span class="keyword">public</span>:<span class="comment"></span>
00036 <span class="comment"> //! contrast is the slope of the function. offset is the intensity</span>
00037 <span class="comment"> //! at which the color stays the same. Above this value, intensities</span>
00038 <span class="comment"> //! are increased. Below it, they are reduced. With offset 128 and</span>
00039 <span class="comment"> //! contrast 1, the image stays unchanged.</span>
00040 <span class="comment"></span> <a class="code" href="classPLFilterContrast.html#a0">PLFilterContrast</a>(<span class="keywordtype">double</span> contrast,
00041 PLBYTE offset);
00042 <span class="keyword">virtual</span> ~<a class="code" href="classPLFilterContrast.html">PLFilterContrast</a>();
00043 <span class="keyword">virtual</span> <span class="keywordtype">void</span> <a class="code" href="classPLFilterContrast.html#a2">Apply</a>(<a class="code" href="classPLBmpBase.html">PLBmpBase</a> *pBmpSource, <a class="code" href="classPLBmp.html">PLBmp</a>* pBmpDest) <span class="keyword">const</span>;
00044
00045 <span class="keyword">protected</span>:
00046 <span class="keywordtype">double</span> m_contrast;
00047 <span class="keywordtype">double</span> m_offset;
00048 };
00049 <span class="preprocessor">#endif</span>
00050 <span class="preprocessor"></span>
00051 <span class="comment">/*</span>
00052 <span class="comment">/--------------------------------------------------------------------</span>
00053 <span class="comment">|</span>
00054 <span class="comment">| $Log: plfiltercontrast_8h-source.html,v $
00054 <span class="comment">| Revision 1.4 2004/09/15 15:26:29 uzadow
00054 <span class="comment">| Linux compatibility changes, doc update.
00054 <span class="comment">|</span>
00055 <span class="comment">| Revision 1.4 2004/06/15 10:26:13 uzadow</span>
00056 <span class="comment">| Initial nonfunctioning version of plbmpbase.</span>
00057 <span class="comment">|</span>
00058 <span class="comment">| Revision 1.3 2002/02/24 13:00:46 uzadow</span>
00059 <span class="comment">| Documentation update; removed buggy PLFilterRotate.</span>
00060 <span class="comment">|</span>
00061 <span class="comment">| Revision 1.2 2001/10/06 22:03:26 uzadow</span>
00062 <span class="comment">| Added PL prefix to basic data types.</span>
00063 <span class="comment">|</span>
00064 <span class="comment">| Revision 1.1 2001/09/16 19:03:23 uzadow</span>
00065 <span class="comment">| Added global name prefix PL, changed most filenames.</span>
00066 <span class="comment">|</span>
00067 <span class="comment">| Revision 1.5 2001/01/15 15:05:31 uzadow</span>
00068 <span class="comment">| Added PLBmp::ApplyFilter() and PLBmp::CreateFilteredCopy()</span>
00069 <span class="comment">|</span>
00070 <span class="comment">| Revision 1.4 2001/01/13 14:44:52 uzadow</span>
00071 <span class="comment">| Doc update.</span>
00072 <span class="comment">|</span>
00073 <span class="comment">| Revision 1.3 2001/01/12 23:30:01 uzadow</span>
00074 <span class="comment">| Doc update.</span>
00075 <span class="comment">|</span>
00076 <span class="comment">| Revision 1.2 2001/01/12 23:04:37 uzadow</span>
00077 <span class="comment">| Comments.</span>
00078 <span class="comment">|</span>
00079 <span class="comment">| Revision 1.1 2000/11/06 23:20:22 uzadow</span>
00080 <span class="comment">| Added Contrast, Intensity and Lightness filters by</span>
00081 <span class="comment">| Thomas Hirschmann</span>
00082 <span class="comment">|</span>
00083 <span class="comment">|</span>
00084 <span class="comment">\--------------------------------------------------------------------</span>
00085 <span class="comment">*/</span>
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