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<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
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<div id="projectbrief">C Image Processing Library</div>
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<h1>alphaclean_reg.c</h1> </div>
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<div class="contents">
<a href="alphaclean__reg_8c.html">Go to the documentation of this file.</a><div class="fragment"><pre class="fragment"><a name="l00001"></a>00001 <span class="comment">/*====================================================================*</span>
<a name="l00002"></a>00002 <span class="comment"> - Copyright (C) 2001 Leptonica. All rights reserved.</span>
<a name="l00003"></a>00003 <span class="comment"> - This software is distributed in the hope that it will be</span>
<a name="l00004"></a>00004 <span class="comment"> - useful, but with NO WARRANTY OF ANY KIND.</span>
<a name="l00005"></a>00005 <span class="comment"> - No author or distributor accepts responsibility to anyone for the</span>
<a name="l00006"></a>00006 <span class="comment"> - consequences of using this software, or for whether it serves any</span>
<a name="l00007"></a>00007 <span class="comment"> - particular purpose or works at all, unless he or she says so in</span>
<a name="l00008"></a>00008 <span class="comment"> - writing. Everyone is granted permission to copy, modify and</span>
<a name="l00009"></a>00009 <span class="comment"> - redistribute this source code, for commercial or non-commercial</span>
<a name="l00010"></a>00010 <span class="comment"> - purposes, with the following restrictions: (1) the origin of this</span>
<a name="l00011"></a>00011 <span class="comment"> - source code must not be misrepresented; (2) modified versions must</span>
<a name="l00012"></a>00012 <span class="comment"> - be plainly marked as such; and (3) this notice may not be removed</span>
<a name="l00013"></a>00013 <span class="comment"> - or altered from any source or modified source distribution.</span>
<a name="l00014"></a>00014 <span class="comment"> *====================================================================*/</span>
<a name="l00015"></a>00015
<a name="l00016"></a>00016 <span class="comment">/*</span>
<a name="l00017"></a>00017 <span class="comment"> * alphaclean_reg.c</span>
<a name="l00018"></a>00018 <span class="comment"> *</span>
<a name="l00019"></a>00019 <span class="comment"> * Tests transparency and cleaning under alpha.</span>
<a name="l00020"></a>00020 <span class="comment"> */</span>
<a name="l00021"></a>00021
<a name="l00022"></a>00022 <span class="preprocessor">#include <stdio.h></span>
<a name="l00023"></a>00023 <span class="preprocessor">#include <stdlib.h></span>
<a name="l00024"></a>00024 <span class="preprocessor">#include "allheaders.h"</span>
<a name="l00025"></a>00025
<a name="l00026"></a><a class="code" href="alphaclean__reg_8c.html#ad60019c86c57c9fe0021e1b2a482462e">00026</a> <span class="keyword">static</span> <span class="keyword">const</span> <a class="code" href="environ_8h.html#a9085c7874153c280a4171244aa052e4e">l_int32</a> <a class="code" href="alphaclean__reg_8c.html#ad60019c86c57c9fe0021e1b2a482462e">SHOW</a> = 0;
<a name="l00027"></a>00027
<a name="l00028"></a><a class="code" href="alphaclean__reg_8c.html#a5ea466849f21e6c2be4ef9b2eb8868d3">00028</a> <a class="code" href="src_2endiantest_8c.html#ae66f6b31b5ad750f1fe042a706a4e3d4">main</a>(<span class="keywordtype">int</span> argc,
<a name="l00029"></a>00029 <span class="keywordtype">char</span> **argv)
<a name="l00030"></a>00030 {
<a name="l00031"></a>00031 <a class="code" href="environ_8h.html#a9085c7874153c280a4171244aa052e4e">l_int32</a> w, h, n1, n2;
<a name="l00032"></a>00032 <a class="code" href="struct_pix.html">PIX</a> *pixs, *pixb, *pixg, *pixc, *pixd;
<a name="l00033"></a>00033 <a class="code" href="struct_pix.html">PIX</a> *pixg2, *pixcs1, *pixcs2, *pixd1, *pixd2, *pixt1, *pixt2;
<a name="l00034"></a>00034 <a class="code" href="struct_pixa.html">PIXA</a> *pixa;
<a name="l00035"></a>00035 <span class="keyword">static</span> <span class="keywordtype">char</span> mainName[] = <span class="stringliteral">"alphaclean_reg"</span>;
<a name="l00036"></a>00036
<a name="l00037"></a>00037 <span class="keywordflow">if</span> (argc != 1)
<a name="l00038"></a>00038 exit(<a class="code" href="environ_8h.html#a8b17fe871312c2e1613fa694bb78a963">ERROR_INT</a>(<span class="stringliteral">" Syntax: alphaclean_reg"</span>, mainName, 1));
<a name="l00039"></a>00039
<a name="l00040"></a>00040 <span class="comment">/* Make the transparency (alpha) layer.</span>
<a name="l00041"></a>00041 <span class="comment"> * pixs is the mask. We turn it into a transparency (alpha)</span>
<a name="l00042"></a>00042 <span class="comment"> * layer by converting to 8 bpp. A small convolution fuzzes</span>
<a name="l00043"></a>00043 <span class="comment"> * the mask edges so that you don't see the pixels. */</span>
<a name="l00044"></a>00044 pixs = <a class="code" href="leptprotos_8h.html#a84634846cbb5e01df667d6e9241dfc53">pixRead</a>(<span class="stringliteral">"feyn-fract.tif"</span>);
<a name="l00045"></a>00045 <a class="code" href="leptprotos_8h.html#a11b8bc890f3872b0a19307f4c5a9b41e">pixGetDimensions</a>(pixs, &w, &h, <a class="code" href="environ_8h.html#a070d2ce7b6bb7e5c05602aa8c308d0c4">NULL</a>);
<a name="l00046"></a>00046 pixg = <a class="code" href="leptprotos_8h.html#a5b37337f1ecff5386328dc324aac36ec">pixConvert1To8</a>(<a class="code" href="environ_8h.html#a070d2ce7b6bb7e5c05602aa8c308d0c4">NULL</a>, pixs, 0, 255);
<a name="l00047"></a>00047 pixg2 = <a class="code" href="convolve_8c.html#a7710dd78bd3e0936426a5bac9a62cd4c">pixBlockconvGray</a>(pixg, <a class="code" href="environ_8h.html#a070d2ce7b6bb7e5c05602aa8c308d0c4">NULL</a>, 1, 1);
<a name="l00048"></a>00048 <a class="code" href="leptprotos_8h.html#abfdb7bca89ec16e69b7f9748823cf7aa">pixDisplayWithTitle</a>(pixg2, 300, 0, <span class="stringliteral">"alpha"</span>, <a class="code" href="alphaclean__reg_8c.html#ad60019c86c57c9fe0021e1b2a482462e">SHOW</a>);
<a name="l00049"></a>00049
<a name="l00050"></a>00050 <span class="comment">/* Make the viewable image.</span>
<a name="l00051"></a>00051 <span class="comment"> * pixc is the image that we see where the alpha layer is</span>
<a name="l00052"></a>00052 <span class="comment"> * opaque -- i.e., greater than 0. Scale it to the same</span>
<a name="l00053"></a>00053 <span class="comment"> * size as the mask. To visualize what this will look like</span>
<a name="l00054"></a>00054 <span class="comment"> * when displayed over a black background, create the black</span>
<a name="l00055"></a>00055 <span class="comment"> * background image, pixb, and do the blending with pixcs1</span>
<a name="l00056"></a>00056 <span class="comment"> * explicitly using the alpha layer pixg2. */</span>
<a name="l00057"></a>00057 pixc = <a class="code" href="leptprotos_8h.html#a84634846cbb5e01df667d6e9241dfc53">pixRead</a>(<span class="stringliteral">"tetons.jpg"</span>);
<a name="l00058"></a>00058 pixcs1 = <a class="code" href="leptprotos_8h.html#abe2059c9d4d4070c1c4986b03311b8f0">pixScaleToSize</a>(pixc, w, h);
<a name="l00059"></a>00059 <a class="code" href="leptprotos_8h.html#abfdb7bca89ec16e69b7f9748823cf7aa">pixDisplayWithTitle</a>(pixcs1, 100, 200, <span class="stringliteral">"viewable"</span>, <a class="code" href="alphaclean__reg_8c.html#ad60019c86c57c9fe0021e1b2a482462e">SHOW</a>);
<a name="l00060"></a>00060 pixb = <a class="code" href="leptprotos_8h.html#a818df07aa55f619dee3073a9f75c5754">pixCreateTemplate</a>(pixcs1); <span class="comment">/* black */</span>
<a name="l00061"></a>00061 pixd1 = <a class="code" href="blend_8c.html#a51d08d3ae19c515a5fabf42db1daf85b">pixBlendWithGrayMask</a>(pixb, pixcs1, pixg2, 0, 0);
<a name="l00062"></a>00062 <a class="code" href="leptprotos_8h.html#abfdb7bca89ec16e69b7f9748823cf7aa">pixDisplayWithTitle</a>(pixd1, 100, 500, <span class="stringliteral">"alpha-blended 1"</span>, <a class="code" href="alphaclean__reg_8c.html#ad60019c86c57c9fe0021e1b2a482462e">SHOW</a>);
<a name="l00063"></a>00063
<a name="l00064"></a>00064 <span class="comment">/* Embed the alpha layer pixg2 into the color image pixc.</span>
<a name="l00065"></a>00065 <span class="comment"> * Write it out as is. Then clean pixcs1 (to 0) under the fully</span>
<a name="l00066"></a>00066 <span class="comment"> * transparent part of the alpha layer, and write that result</span>
<a name="l00067"></a>00067 <span class="comment"> * out as well. */</span>
<a name="l00068"></a>00068 <a class="code" href="leptprotos_8h.html#a17e981c7b37f5eb4e9f5dd4d2be66e2b">pixSetRGBComponent</a>(pixcs1, pixg2, <a class="code" href="pix_8h.html#a7ff5f2dff38e7639981794c43dc9167baad42ae4714038f26507c5966986b1f56">L_ALPHA_CHANNEL</a>);
<a name="l00069"></a>00069 <a class="code" href="leptprotos_8h.html#a78496d6f623d4a07f9152b5f46d08d49">pixWriteRGBAPng</a>(<span class="stringliteral">"/tmp/junkpixcs1.png"</span>, pixcs1);
<a name="l00070"></a>00070 pixcs2 = <a class="code" href="leptprotos_8h.html#a42974579389e4be6e372f5e22c67df21">pixSetUnderTransparency</a>(pixcs1, 0, 0);
<a name="l00071"></a>00071 <a class="code" href="leptprotos_8h.html#a78496d6f623d4a07f9152b5f46d08d49">pixWriteRGBAPng</a>(<span class="stringliteral">"/tmp/junkpixcs2.png"</span>, pixcs2);
<a name="l00072"></a>00072
<a name="l00073"></a>00073 <span class="comment">/* What will this look like over a black background?</span>
<a name="l00074"></a>00074 <span class="comment"> * Do the blending explicitly and display. It should</span>
<a name="l00075"></a>00075 <span class="comment"> * look identical to the blended result pixd1 before cleaning. */</span>
<a name="l00076"></a>00076 pixd2 = <a class="code" href="blend_8c.html#a51d08d3ae19c515a5fabf42db1daf85b">pixBlendWithGrayMask</a>(pixb, pixcs2, pixg2, 0, 0);
<a name="l00077"></a>00077 <a class="code" href="leptprotos_8h.html#abfdb7bca89ec16e69b7f9748823cf7aa">pixDisplayWithTitle</a>(pixd2, 600, 500, <span class="stringliteral">"alpha blended 2"</span>, <a class="code" href="alphaclean__reg_8c.html#ad60019c86c57c9fe0021e1b2a482462e">SHOW</a>);
<a name="l00078"></a>00078
<a name="l00079"></a>00079 <span class="comment">/* Read the two images back, ignoring the transparency layer.</span>
<a name="l00080"></a>00080 <span class="comment"> * The uncleaned image will come back identical to pixcs1.</span>
<a name="l00081"></a>00081 <span class="comment"> * However, the cleaned image will be black wherever</span>
<a name="l00082"></a>00082 <span class="comment"> * the alpha layer was fully transparent. It will </span>
<a name="l00083"></a>00083 <span class="comment"> * look the same when viewed through the alpha layer,</span>
<a name="l00084"></a>00084 <span class="comment"> * but have much better compression. */</span>
<a name="l00085"></a>00085 pixt1 = <a class="code" href="leptprotos_8h.html#a84634846cbb5e01df667d6e9241dfc53">pixRead</a>(<span class="stringliteral">"/tmp/junkpixcs1.png"</span>); <span class="comment">/* just pixcs1 */</span>
<a name="l00086"></a>00086 pixt2 = <a class="code" href="leptprotos_8h.html#a84634846cbb5e01df667d6e9241dfc53">pixRead</a>(<span class="stringliteral">"/tmp/junkpixcs2.png"</span>); <span class="comment">/* cleaned out under transparent */</span>
<a name="l00087"></a>00087 n1 = <a class="code" href="leptprotos_8h.html#ae5e93328f830c77f5b4124d2baea1d9f">nbytesInFile</a>(<span class="stringliteral">"/tmp/junkpixcs1.png"</span>);
<a name="l00088"></a>00088 n2 = <a class="code" href="leptprotos_8h.html#ae5e93328f830c77f5b4124d2baea1d9f">nbytesInFile</a>(<span class="stringliteral">"/tmp/junkpixcs2.png"</span>);
<a name="l00089"></a>00089 fprintf(stderr, <span class="stringliteral">" Original: %d bytes\n Cleaned: %d bytes\n"</span>, n1, n2);
<a name="l00090"></a>00090 <a class="code" href="leptprotos_8h.html#abfdb7bca89ec16e69b7f9748823cf7aa">pixDisplayWithTitle</a>(pixt1, 600, 200, <span class="stringliteral">"without alpha"</span>, <a class="code" href="alphaclean__reg_8c.html#ad60019c86c57c9fe0021e1b2a482462e">SHOW</a>);
<a name="l00091"></a>00091 <a class="code" href="leptprotos_8h.html#abfdb7bca89ec16e69b7f9748823cf7aa">pixDisplayWithTitle</a>(pixt2, 300, 800, <span class="stringliteral">"cleaned under transparent"</span>, <a class="code" href="alphaclean__reg_8c.html#ad60019c86c57c9fe0021e1b2a482462e">SHOW</a>);
<a name="l00092"></a>00092
<a name="l00093"></a>00093 pixa = <a class="code" href="leptprotos_8h.html#a7a6d1b9b5457c3dc9bc8f77a39a81147">pixaCreate</a>(0);
<a name="l00094"></a>00094 <a class="code" href="leptprotos_8h.html#a5bdc8398d337c9a8a7495421d34b8f2d">pixSaveTiled</a>(pixg2, pixa, 1, 1, 20, 32);
<a name="l00095"></a>00095 <a class="code" href="leptprotos_8h.html#a5bdc8398d337c9a8a7495421d34b8f2d">pixSaveTiled</a>(pixcs1, pixa, 1, 1, 20, 0);
<a name="l00096"></a>00096 <a class="code" href="leptprotos_8h.html#a5bdc8398d337c9a8a7495421d34b8f2d">pixSaveTiled</a>(pixt1, pixa, 1, 0, 20, 0);
<a name="l00097"></a>00097 <a class="code" href="leptprotos_8h.html#a5bdc8398d337c9a8a7495421d34b8f2d">pixSaveTiled</a>(pixd1, pixa, 1, 1, 20, 0);
<a name="l00098"></a>00098 <a class="code" href="leptprotos_8h.html#a5bdc8398d337c9a8a7495421d34b8f2d">pixSaveTiled</a>(pixd2, pixa, 1, 0, 20, 0);
<a name="l00099"></a>00099 <a class="code" href="leptprotos_8h.html#a5bdc8398d337c9a8a7495421d34b8f2d">pixSaveTiled</a>(pixt2, pixa, 1, 1, 20, 0);
<a name="l00100"></a>00100 pixd = <a class="code" href="leptprotos_8h.html#a6535561de2a8024c72d75babe15131a9">pixaDisplay</a>(pixa, 0, 0);
<a name="l00101"></a>00101 <a class="code" href="leptprotos_8h.html#ae8a779aa459f8d1c386363bf2a5c06f5">pixDisplay</a>(pixd, 100, 100);
<a name="l00102"></a>00102 <a class="code" href="leptprotos_8h.html#a5a9a534e77de5e57d74ff3d678ca59e0">pixWrite</a>(<span class="stringliteral">"/tmp/junkalpha.png"</span>, pixd, <a class="code" href="imageio_8h.html#a726ca809ffd3d67ab4b8476646f26635af0d248e8c70ac2d66a436f0967d6663e">IFF_JFIF_JPEG</a>);
<a name="l00103"></a>00103 <a class="code" href="leptprotos_8h.html#a1b238e61b64e4e5c62f44849cddb9658">pixDestroy</a>(&pixd);
<a name="l00104"></a>00104 <a class="code" href="leptprotos_8h.html#a6775cff91fdef2336a3f3037f7bb55f3">pixaDestroy</a>(&pixa);
<a name="l00105"></a>00105
<a name="l00106"></a>00106 <a class="code" href="leptprotos_8h.html#a1b238e61b64e4e5c62f44849cddb9658">pixDestroy</a>(&pixs);
<a name="l00107"></a>00107 <a class="code" href="leptprotos_8h.html#a1b238e61b64e4e5c62f44849cddb9658">pixDestroy</a>(&pixb);
<a name="l00108"></a>00108 <a class="code" href="leptprotos_8h.html#a1b238e61b64e4e5c62f44849cddb9658">pixDestroy</a>(&pixg);
<a name="l00109"></a>00109 <a class="code" href="leptprotos_8h.html#a1b238e61b64e4e5c62f44849cddb9658">pixDestroy</a>(&pixg2);
<a name="l00110"></a>00110 <a class="code" href="leptprotos_8h.html#a1b238e61b64e4e5c62f44849cddb9658">pixDestroy</a>(&pixc);
<a name="l00111"></a>00111 <a class="code" href="leptprotos_8h.html#a1b238e61b64e4e5c62f44849cddb9658">pixDestroy</a>(&pixcs1);
<a name="l00112"></a>00112 <a class="code" href="leptprotos_8h.html#a1b238e61b64e4e5c62f44849cddb9658">pixDestroy</a>(&pixcs2);
<a name="l00113"></a>00113 <a class="code" href="leptprotos_8h.html#a1b238e61b64e4e5c62f44849cddb9658">pixDestroy</a>(&pixd);
<a name="l00114"></a>00114 <a class="code" href="leptprotos_8h.html#a1b238e61b64e4e5c62f44849cddb9658">pixDestroy</a>(&pixd1);
<a name="l00115"></a>00115 <a class="code" href="leptprotos_8h.html#a1b238e61b64e4e5c62f44849cddb9658">pixDestroy</a>(&pixd2);
<a name="l00116"></a>00116 <a class="code" href="leptprotos_8h.html#a1b238e61b64e4e5c62f44849cddb9658">pixDestroy</a>(&pixt1);
<a name="l00117"></a>00117 <a class="code" href="leptprotos_8h.html#a1b238e61b64e4e5c62f44849cddb9658">pixDestroy</a>(&pixt2);
<a name="l00118"></a>00118 <span class="keywordflow">return</span> 0;
<a name="l00119"></a>00119 }
<a name="l00120"></a>00120
<a name="l00121"></a>00121
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