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200<div class="main">
201
cristy350dea42011-02-15 17:31:04 +0000[diff] [blame]202<h1>Module histogram Methods</h1>
cristy6f77f692011-02-15 15:31:39 +0000[diff] [blame]203<p class="navigation-index">[<a href="#GetImageHistogram">GetImageHistogram</a> &bull; <a href="#IsHistogramImage">IsHistogramImage</a> &bull; <a href="#IsPaletteImage">IsPaletteImage</a> &bull; <a href="#MinMaxStretchImage">MinMaxStretchImage</a> &bull; <a href="#GetNumberColors">GetNumberColors</a> &bull; <a href="#UniqueImageColors">UniqueImageColors</a>]</p>
cristy3ed852e2009-09-05 21:47:34 +0000[diff] [blame]204
cristy350dea42011-02-15 17:31:04 +0000[diff] [blame]205<h2><a href="http://www.imagemagick.org/api/MagickCore/histogram_8c.html" id="GetImageHistogram">GetImageHistogram</a></h2>
cristy6f77f692011-02-15 15:31:39 +0000[diff] [blame]206<div class="doc-section">
207
208<p>GetImageHistogram() returns the unique colors in an image.</p>
209
210<p>The format of the GetImageHistogram method is:</p>
211
212<pre class="code">
213 size_t GetImageHistogram(const Image *image,
214 size_t *number_colors,ExceptionInfo *exception)
215</pre>
216
217<p>A description of each parameter follows.</p>
218
219<h5>image</h5>
220<p>the image.</p>
221
222<h5>file</h5>
223<p>Write a histogram of the color distribution to this file handle.</p>
224
225<h5>exception</h5>
226<p>return any errors or warnings in this structure.</p>
227
228 </div>
cristy350dea42011-02-15 17:31:04 +0000[diff] [blame]229<h2><a href="http://www.imagemagick.org/api/MagickCore/histogram_8c.html" id="IsHistogramImage">IsHistogramImage</a></h2>
cristy6f77f692011-02-15 15:31:39 +0000[diff] [blame]230<div class="doc-section">
231
232<p>IsHistogramImage() returns MagickTrue if the image has 1024 unique colors or less.</p>
233
234<p>The format of the IsHistogramImage method is:</p>
235
236<pre class="code">
237 MagickBooleanType IsHistogramImage(const Image *image,
238 ExceptionInfo *exception)
239</pre>
240
241<p>A description of each parameter follows.</p>
242
243<h5>image</h5>
244<p>the image.</p>
245
246<h5>exception</h5>
247<p>return any errors or warnings in this structure.</p>
248
249 </div>
cristy350dea42011-02-15 17:31:04 +0000[diff] [blame]250<h2><a href="http://www.imagemagick.org/api/MagickCore/histogram_8c.html" id="IsPaletteImage">IsPaletteImage</a></h2>
cristy6f77f692011-02-15 15:31:39 +0000[diff] [blame]251<div class="doc-section">
252
253<p>IsPaletteImage() returns MagickTrue if the image is PseudoClass and has 256 unique colors or less.</p>
254
255<p>The format of the IsPaletteImage method is:</p>
256
257<pre class="code">
258 MagickBooleanType IsPaletteImage(const Image *image,
259 ExceptionInfo *exception)
260</pre>
261
262<p>A description of each parameter follows.</p>
263
264<h5>image</h5>
265<p>the image.</p>
266
267<h5>exception</h5>
268<p>return any errors or warnings in this structure.</p>
269
270 </div>
cristy350dea42011-02-15 17:31:04 +0000[diff] [blame]271<h2><a href="http://www.imagemagick.org/api/MagickCore/histogram_8c.html" id="MinMaxStretchImage">MinMaxStretchImage</a></h2>
cristy6f77f692011-02-15 15:31:39 +0000[diff] [blame]272<div class="doc-section">
273
274<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>
275
cristybaacd172011-04-30 23:11:03 +0000[diff] [blame]276<p>If the adjustment values are both zero this function is equivalent to a perfect normalization (or autolevel) of the image.</p>
cristy6f77f692011-02-15 15:31:39 +0000[diff] [blame]277
278<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>
279
280<p>In the special case that only ONE value is found in a channel of the image that value is not stretched, that value is left as is.</p>
281
282<p>The 'SyncChannels' is turned on in the 'DefaultChannels' setting by default.</p>
283
284<p>The format of the MinMaxStretchImage method is:</p>
285
286<pre class="code">
287 MagickBooleanType MinMaxStretchImage(Image *image,
288 const ChannelType channel, const double black_adjust,
289 const double white_adjust)
290</pre>
291
292<p>A description of each parameter follows:</p>
293
294<h5>image</h5>
295<p>The image to auto-level</p>
296
297<h5>channel</h5>
298<p>The channels to auto-level. If the special 'SyncChannels' flag is set, all the given channels are stretched by the same amount.</p>
299
300<h5>black_adjust, white_adjust</h5>
301<p>Move the Black/White Point inward from the minimum and maximum points by this color value.</p>
302
303 </div>
cristy350dea42011-02-15 17:31:04 +0000[diff] [blame]304<h2><a href="http://www.imagemagick.org/api/MagickCore/histogram_8c.html" id="GetNumberColors">GetNumberColors</a></h2>
cristy6f77f692011-02-15 15:31:39 +0000[diff] [blame]305<div class="doc-section">
306
307<p>GetNumberColors() returns the number of unique colors in an image.</p>
308
309<p>The format of the GetNumberColors method is:</p>
310
311<pre class="code">
312 size_t GetNumberColors(const Image *image,FILE *file,
313 ExceptionInfo *exception)
314</pre>
315
316<p>A description of each parameter follows.</p>
317
318<h5>image</h5>
319<p>the image.</p>
320
321<h5>file</h5>
322<p>Write a histogram of the color distribution to this file handle.</p>
323
324<h5>exception</h5>
325<p>return any errors or warnings in this structure.</p>
326
327 </div>
cristy350dea42011-02-15 17:31:04 +0000[diff] [blame]328<h2><a href="http://www.imagemagick.org/api/MagickCore/histogram_8c.html" id="UniqueImageColors">UniqueImageColors</a></h2>
cristy6f77f692011-02-15 15:31:39 +0000[diff] [blame]329<div class="doc-section">
330
331<p>UniqueImageColors() returns the unique colors of an image.</p>
332
333<p>The format of the UniqueImageColors method is:</p>
334
335<pre class="code">
336 Image *UniqueImageColors(const Image *image,ExceptionInfo *exception)
337</pre>
338
339<p>A description of each parameter follows.</p>
340
341<h5>image</h5>
342<p>the image.</p>
343
344<h5>exception</h5>
345<p>return any errors or warnings in this structure.</p>
346
347 </div>
cristy3eaa0ef2010-03-06 20:35:26 +0000[diff] [blame]348
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