1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
|
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Strict//EN"
"http://www.w3.org/TR/xhtml1/DTD/xhtml1-strict.dtd">
<html xmlns="http://www.w3.org/1999/xhtml" xml:lang="en" lang="en">
<head>
<meta http-equiv="Content-Type" value="application/xhtml+xml" />
<meta name="verify-v1" content="g222frIIxcQTrvDR3NBRUSKP3AnMNoqxOkIniCEkV7U=" />
<link rel="meta" type="application/rdf+xml" title="ICI" href="http://imagemagick.org/ici.rdf" />
<style type="text/css" media="screen,projection"><!--
@import url("../../www/magick.css");
--></style>
<link rel="shortcut icon" href="../../images/wand.ico" type="images/vnd.microsoft.icon"/>
<title>ImageMagick: MagickCore, C API for ImageMagick: Image Histograms</title>
<meta http-equiv="Content-Language" content="en-US"/>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8"/>
<meta http-equiv="Reply-to" content="magick-users@imagemagick.org"/>
<meta name="Generator" content="PHP"/>
<meta name="Keywords" content="magickcore, c, api, for, imagemagick:, image, histograms, ImageMagick, ImageMagic, MagickCore, MagickWand, PerlMagick, Magick++, RMagick, PythonMagick, JMagick, TclMagick, Image, Magick, Magic, Wand, ImageMagickObject, Swiss, Army, Knife, Image, Processing"/>
<meta name="Description" content="ImageMagick® is a software suite to create, edit, and compose bitmap images. It can read, convert and write images in a variety of formats (about 100) including GIF, JPEG, JPEG-2000, PNG, PDF, PhotoCD, TIFF, and DPX. Use ImageMagick to translate, flip, mirror, rotate, scale, shear and transform images, adjust image colors, apply various special effects, or draw text, lines, polygons, ellipses and Bézier curves. ImageMagick is free software delivered as a ready-to-run binary distribution or as source code that you can freely use, copy, modify, and distribute. Its license is compatible with the GPL. It runs on all major operating systems. The functionality of ImageMagick is typically utilized from the command line or you can use the features from programs written in your favorite programming language. Choose from these interfaces: MagickCore (C), MagickWand (C), ChMagick (Ch), Magick++ (C++), JMagick (Java), L-Magick (Lisp), PascalMagick (Pascal), PerlMagick (Perl), MagickWand for PHP (PHP), PythonMagick (Python), RMagick (Ruby), or TclMagick (Tcl/TK). With a language interface, use ImageMagick to modify or create images automagically and dynamically."/>
<meta name="Rating" content="GENERAL"/>
<meta name="Robots" content="INDEX, FOLLOW"/>
<meta name="Generator" content="ImageMagick Studio LLC"/>
<meta name="Author" content="ImageMagick Studio LLC"/>
<meta name="Revisit-after" content="2 DAYS"/>
<meta name="Resource-type" content="document"/>
<meta name="Copyright" content="Copyright (c) 1999-2010 ImageMagick Studio LLC"/>
<meta name="Distribution" content="Global"/>
</head>
<body id="www-imagemagick-org">
<div class="titlebar">
<a href="../../index.html">
<img src="../../images/script.png" alt="[ImageMagick]"
style="width: 350px; height: 60px; margin: 28px auto; float: left;" /></a>
<a href="http://www.networkredux.com">
<img src="../../images/networkredux.png" alt="[sponsor]"
style="margin: 45px auto; border: 0px; float: left;" /></a>
<a href="http://www.imagemagick.org/discourse-server/">
<img src="../../images/logo.jpg" alt=""
style="width: 114px; height: 118px; border: 0px; float: right;" /></a>
<a href="../../index.html">
<img src="../../images/sprite.jpg" alt=""
style="width: 114px; height: 118px; border: 0px; float: right;" /></a>
</div>
<div class="eastbar">
<div class="menu">
<a href="../../index.html">About ImageMagick</a>
</div>
<div class="sep"></div>
<div class="menu">
<a href="../../www/command-line-tools.html">Command-line Tools</a>
</div>
<div class="sub">
<a href="../../www/command-line-processing.html">Processing</a>
</div>
<div class="sub">
<a href="../../www/command-line-options.html">Options</a>
</div>
<div class="sub">
<a href="http://www.imagemagick.org/Usage/">Usage</a>
</div>
<div class="menu">
<a href="../../www/api.html">Program Interfaces</a>
</div>
<div class="sub">
<a href="../../www/magick-wand.html">MagickWand</a>
</div>
<div class="sub">
<a href="../../www/magick-core.html">MagickCore</a>
</div>
<div class="sub">
<a href="../../www/perl-magick.html">PerlMagick</a>
</div>
<div class="sub">
<a href="../../Magick++/">Magick++</a>
</div>
<div class="menu">
<a href="../../www/architecture.html">Architecture</a>
</div>
<div class="sep"></div>
<div class="menu">
<a href="../../www/install-source.html">Install from Source</a>
</div>
<div class="sub">
<a href="../../www/install-source.html#unix">Unix</a>
</div>
<div class="sub">
<a href="../../www/install-source.html#windows">Windows</a>
</div>
<div class="menu">
<a href="../../www/binary-releases.html">Binary Releases</a>
</div>
<div class="sub">
<a href="../../www/binary-releases.html#unix">Unix</a>
</div>
<div class="sub">
<a href="../../www/binary-releases.html#macosx">Mac OS X</a>
</div>
<div class="sub">
<a href="../../www/binary-releases.html#windows">Windows</a>
</div>
<div class="menu">
<a href="../../www/resources.html">Resources</a>
</div>
<div class="sep"></div>
<div class="menu">
<a href="../../www/download.html">Download</a>
</div>
<div class="sep"></div>
<div class="menu">
<a href="../http://www.imagemagick.org/script/search.php">Search</a>
</div>
<div class="sep"></div>
<div class="menu">
<a href="../../www/sitemap.html">Site Map</a>
</div>
<div class="sub">
<a href="../../www/links.html">Links</a>
</div>
<div class="sep"></div>
<div class="menu">
<a href="../../www/sponsors.html">Sponsors:</a>
<div class="sponsbox">
<div class="sponsor">
<a href="http://www.geschenke-elsen.de/" title="Lampe Berger">Lampe Berger</a><!-- 20106101000040 -->
</div>
<div class="sponsor">
<a href="http://www.deko.net">Deko.net</a><!-- 201101010600 Peterssen-->
</div>
<div class="sponsor">
<a href="http://www.tomsgutscheine.de">Tom's Gutscheine</a><!-- 201005010360 invendio.de-->
</div>
<div class="sponsor">
<a href="http://www.online-kredit-index.de">Kredit</a><!-- 201007010120 Buchhorn -->
</div>
<div class="sponsor">
<a href="http://www.blumenversender.com">Blumenversand</a><!-- 201005010120 -->
</div>
<div class="sponsor">
<a href="http://www.print24.de/">Druckerei</a><!-- 201009010720 -->
</div>
<div class="sponsor">
<a href="http://www.goyax.de">Börse</a><!-- 201004010240 Gewiese digital-finance.de -->
</div>
<div class="sponsor">
<a href="http://www.allesdruck.de">Druckerei Online</a><!-- 201012011200 allesdruck.de-->
</div>
</div>
</div>
</div>
<div class="main">
<p class="navigation-index">[<a href="#GetImageHistogram">GetImageHistogram</a> • <a href="#IsHistogramImage">IsHistogramImage</a> • <a href="#IsPaletteImage">IsPaletteImage</a> • <a href="#MinMaxStretchImage">MinMaxStretchImage</a> • <a href="#GetNumberColors">GetNumberColors</a> • <a href="#UniqueImageColors">UniqueImageColors</a>]</p>
<h2><a href="http://www.imagemagick.org/api/MagickCore/histogram
_8c.html" target="source" name="GetImageHistogram">GetImageHistogram</a></h2>
<div class="doc-section">
<p>GetImageHistogram() returns the unique colors in an image.</p></ol>
<p>The format of the GetImageHistogram method is:</p>
<pre class="code">
unsigned long GetImageHistogram(const Image *image,
unsigned long *number_colors,ExceptionInfo *exception)
</pre>
<p>A description of each parameter follows.</p></ol>
<h5>image</h5>
<ol><p>the image.</p></ol>
<h5>file</h5>
<ol><p>Write a histogram of the color distribution to this file handle.</p></ol>
<h5>exception</h5>
<ol><p>return any errors or warnings in this structure.</p></ol>
</div>
<h2><a href="http://www.imagemagick.org/api/MagickCore/histogram
_8c.html" target="source" name="IsHistogramImage">IsHistogramImage</a></h2>
<div class="doc-section">
<p>IsHistogramImage() returns MagickTrue if the image has 1024 unique colors or less.</p></ol>
<p>The format of the IsHistogramImage method is:</p>
<pre class="code">
MagickBooleanType IsHistogramImage(const Image *image,
ExceptionInfo *exception)
</pre>
<p>A description of each parameter follows.</p></ol>
<h5>image</h5>
<ol><p>the image.</p></ol>
<h5>exception</h5>
<ol><p>return any errors or warnings in this structure.</p></ol>
</div>
<h2><a href="http://www.imagemagick.org/api/MagickCore/histogram
_8c.html" target="source" name="IsPaletteImage">IsPaletteImage</a></h2>
<div class="doc-section">
<p>IsPaletteImage() returns MagickTrue if the image is PseudoClass and has 256 unique colors or less.</p></ol>
<p>The format of the IsPaletteImage method is:</p>
<pre class="code">
MagickBooleanType IsPaletteImage(const Image *image,
ExceptionInfo *exception)
</pre>
<p>A description of each parameter follows.</p></ol>
<h5>image</h5>
<ol><p>the image.</p></ol>
<h5>exception</h5>
<ol><p>return any errors or warnings in this structure.</p></ol>
</div>
<h2><a href="http://www.imagemagick.org/api/MagickCore/histogram
_8c.html" target="source" name="MinMaxStretchImage">MinMaxStretchImage</a></h2>
<div class="doc-section">
<p>MinMaxStretchImage() uses the exact minimum and maximum values found in each of the channels given, as the BlackPoint and WhitePoint to linearly stretch the colors (and histogram) of the image. The stretch points are also moved further inward by the adjustment values given.</p></ol>
<p>If the adjustment values are both zero this function is equivelent to a perfect normalization (or autolevel) of the image.</p></ol>
<p>Each channel is stretched independantally of each other (producing color distortion) unless the special 'SyncChannels' flag is also provided in the channels setting. If this flag is present the minimum and maximum point will be extracted from all the given channels, and those channels will be stretched by exactly the same amount (preventing color distortion).</p></ol>
<p>The 'SyncChannels' is turned on in the 'DefaultChannels' setting by default.</p></ol>
<p>The format of the MinMaxStretchImage method is:</p>
<pre class="code">
MagickBooleanType MinMaxStretchImage(Image *image,
const ChannelType channel, const double black_adjust,
const double white_adjust)
</pre>
<p>A description of each parameter follows:</p></ol>
<h5>image</h5>
<ol><p>The image to auto-level</p></ol>
<h5>channel</h5>
<ol><p>The channels to auto-level. If the special 'SyncChannels' flag is set, all the given channels are stretched by the same amount.</p></ol>
<h5>black_adjust, white_adjust</h5>
<ol><p>Move the Black/White Point inward from the minimum and maximum points by this color value.</p></ol>
</div>
<h2><a href="http://www.imagemagick.org/api/MagickCore/histogram
_8c.html" target="source" name="GetNumberColors">GetNumberColors</a></h2>
<div class="doc-section">
<p>GetNumberColors() returns the number of unique colors in an image.</p></ol>
<p>The format of the GetNumberColors method is:</p>
<pre class="code">
unsigned long GetNumberColors(const Image *image,FILE *file,
ExceptionInfo *exception)
</pre>
<p>A description of each parameter follows.</p></ol>
<h5>image</h5>
<ol><p>the image.</p></ol>
<h5>file</h5>
<ol><p>Write a histogram of the color distribution to this file handle.</p></ol>
<h5>exception</h5>
<ol><p>return any errors or warnings in this structure.</p></ol>
</div>
<h2><a href="http://www.imagemagick.org/api/MagickCore/histogram
_8c.html" target="source" name="UniqueImageColors">UniqueImageColors</a></h2>
<div class="doc-section">
<p>UniqueImageColors() returns the unique colors of an image.</p></ol>
<p>The format of the UniqueImageColors method is:</p>
<pre class="code">
Image *UniqueImageColors(const Image *image,ExceptionInfo *exception)
</pre>
<p>A description of each parameter follows.</p></ol>
<h5>image</h5>
<ol><p>the image.</p></ol>
<h5>exception</h5>
<ol><p>return any errors or warnings in this structure.</p></ol>
</div>
</div>
<div id="linkbar">
<!-- <span id="linkbar-west"> </span> -->
<span id="linkbar-center">
<a href="http://www.imagemagick.org/discourse-server/">Discourse Server</a> •
<a href="http://studio.webbyland.com/ImageMagick/MagickStudio/scripts/MagickStudio.cgi">Studio</a>
</span>
<span id="linkbar-east"> </span>
</div>
<div class="footer">
<span id="footer-west">© 1999-2010 ImageMagick Studio LLC</span>
<span id="footer-east"> <a href="../http://www.imagemagick.org/script/contact.php">Contact the Wizards</a></span>
</div>
<div style="clear: both; margin: 0; width: 100%; "></div>
</body>
</html>
|
