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216<div class="main">
217
cristy350dea42011-02-15 17:31:04 +0000[diff] [blame]218<h1>Module statistic Methods</h1>
cristy0f7728a2011-07-08 16:51:28 +0000[diff] [blame]219<p class="navigation-index">[<a href="#EvaluateImage">EvaluateImage</a> &bull; <a href="#FunctionImage">FunctionImage</a> &bull; <a href="#GetImageExtrema">GetImageExtrema</a> &bull; <a href="#GetImageMean">GetImageMean</a> &bull; <a href="#GetImageKurtosis">GetImageKurtosis</a> &bull; <a href="#GetImageRange">GetImageRange</a> &bull; <a href="#GetImageStatistics">GetImageStatistics</a>]</p>
cristy3749be42010-02-02 02:46:51 +0000[diff] [blame]220
cristy350dea42011-02-15 17:31:04 +0000[diff] [blame]221<h2><a href="http://www.imagemagick.org/api/MagickCore/statistic_8c.html" id="EvaluateImage">EvaluateImage</a></h2>
cristy6f77f692011-02-15 15:31:39 +0000[diff] [blame]222<div class="doc-section">
223
224<p>EvaluateImage() applies a value to the image with an arithmetic, relational, or logical operator to an image. Use these operations to lighten or darken an image, to increase or decrease contrast in an image, or to produce the "negative" of an image.</p>
225
cristy0f7728a2011-07-08 16:51:28 +0000[diff] [blame]226<p>The format of the EvaluateImage method is:</p>
cristy6f77f692011-02-15 15:31:39 +0000[diff] [blame]227
228<pre class="code">
229 MagickBooleanType EvaluateImage(Image *image,
230 const MagickEvaluateOperator op,const double value,
231 ExceptionInfo *exception)
232 MagickBooleanType EvaluateImages(Image *images,
233 const MagickEvaluateOperator op,const double value,
234 ExceptionInfo *exception)
cristy6f77f692011-02-15 15:31:39 +0000[diff] [blame]235</pre>
236
237<p>A description of each parameter follows:</p>
238
239<h5>image</h5>
240<p>the image.</p>
241
cristy6f77f692011-02-15 15:31:39 +0000[diff] [blame]242<h5>op</h5>
243<p>A channel op.</p>
244
245<h5>value</h5>
246<p>A value value.</p>
247
248<h5>exception</h5>
249<p>return any errors or warnings in this structure.</p>
250
251 </div>
cristy350dea42011-02-15 17:31:04 +0000[diff] [blame]252<h2><a href="http://www.imagemagick.org/api/MagickCore/statistic_8c.html" id="FunctionImage">FunctionImage</a></h2>
cristy6f77f692011-02-15 15:31:39 +0000[diff] [blame]253<div class="doc-section">
254
255<p>FunctionImage() applies a value to the image with an arithmetic, relational, or logical operator to an image. Use these operations to lighten or darken an image, to increase or decrease contrast in an image, or to produce the "negative" of an image.</p>
256
cristy0f7728a2011-07-08 16:51:28 +0000[diff] [blame]257<p>The format of the FunctionImage method is:</p>
cristy6f77f692011-02-15 15:31:39 +0000[diff] [blame]258
259<pre class="code">
260 MagickBooleanType FunctionImage(Image *image,
261 const MagickFunction function,const ssize_t number_parameters,
262 const double *parameters,ExceptionInfo *exception)
cristy6f77f692011-02-15 15:31:39 +0000[diff] [blame]263</pre>
264
265<p>A description of each parameter follows:</p>
266
267<h5>image</h5>
268<p>the image.</p>
269
cristy6f77f692011-02-15 15:31:39 +0000[diff] [blame]270<h5>function</h5>
271<p>A channel function.</p>
272
273<h5>parameters</h5>
274<p>one or more parameters.</p>
275
276<h5>exception</h5>
277<p>return any errors or warnings in this structure.</p>
278
279 </div>
cristy0f7728a2011-07-08 16:51:28 +0000[diff] [blame]280<h2><a href="http://www.imagemagick.org/api/MagickCore/statistic_8c.html" id="GetImageExtrema">GetImageExtrema</a></h2>
cristy6f77f692011-02-15 15:31:39 +0000[diff] [blame]281<div class="doc-section">
282
cristy0f7728a2011-07-08 16:51:28 +0000[diff] [blame]283<p>GetImageExtrema() returns the extrema of one or more image channels.</p>
cristy6f77f692011-02-15 15:31:39 +0000[diff] [blame]284
cristy0f7728a2011-07-08 16:51:28 +0000[diff] [blame]285<p>The format of the GetImageExtrema method is:</p>
cristy6f77f692011-02-15 15:31:39 +0000[diff] [blame]286
287<pre class="code">
cristy0f7728a2011-07-08 16:51:28 +0000[diff] [blame]288 MagickBooleanType GetImageExtrema(const Image *image,size_t *minima,
289 size_t *maxima,ExceptionInfo *exception)
cristy6f77f692011-02-15 15:31:39 +0000[diff] [blame]290</pre>
291
292<p>A description of each parameter follows:</p>
293
294<h5>image</h5>
295<p>the image.</p>
296
cristy6f77f692011-02-15 15:31:39 +0000[diff] [blame]297<h5>minima</h5>
298<p>the minimum value in the channel.</p>
299
300<h5>maxima</h5>
301<p>the maximum value in the channel.</p>
302
303<h5>exception</h5>
304<p>return any errors or warnings in this structure.</p>
305
306 </div>
cristy0f7728a2011-07-08 16:51:28 +0000[diff] [blame]307<h2><a href="http://www.imagemagick.org/api/MagickCore/statistic_8c.html" id="GetImageMean">GetImageMean</a></h2>
cristy6f77f692011-02-15 15:31:39 +0000[diff] [blame]308<div class="doc-section">
309
cristy0f7728a2011-07-08 16:51:28 +0000[diff] [blame]310<p>GetImageMean() returns the mean and standard deviation of one or more image channels.</p>
311
312<p>The format of the GetImageMean method is:</p>
313
314<pre class="code">
315 MagickBooleanType GetImageMean(const Image *image,double *mean,
316 double *standard_deviation,ExceptionInfo *exception)
317</pre>
318
319<p>A description of each parameter follows:</p>
320
321<h5>image</h5>
322<p>the image.</p>
323
324<h5>mean</h5>
325<p>the average value in the channel.</p>
326
327<h5>standard_deviation</h5>
328<p>the standard deviation of the channel.</p>
329
330<h5>exception</h5>
331<p>return any errors or warnings in this structure.</p>
332
333 </div>
334<h2><a href="http://www.imagemagick.org/api/MagickCore/statistic_8c.html" id="GetImageKurtosis">GetImageKurtosis</a></h2>
335<div class="doc-section">
336
337<p>GetImageKurtosis() returns the kurtosis and skewness of one or more image channels.</p>
338
339<p>The format of the GetImageKurtosis method is:</p>
340
341<pre class="code">
342 MagickBooleanType GetImageKurtosis(const Image *image,double *kurtosis,
343 double *skewness,ExceptionInfo *exception)
344</pre>
345
346<p>A description of each parameter follows:</p>
347
348<h5>image</h5>
349<p>the image.</p>
350
351<h5>kurtosis</h5>
352<p>the kurtosis of the channel.</p>
353
354<h5>skewness</h5>
355<p>the skewness of the channel.</p>
356
357<h5>exception</h5>
358<p>return any errors or warnings in this structure.</p>
359
360 </div>
361<h2><a href="http://www.imagemagick.org/api/MagickCore/statistic_8c.html" id="GetImageRange">GetImageRange</a></h2>
362<div class="doc-section">
363
364<p>GetImageRange() returns the range of one or more image channels.</p>
365
366<p>The format of the GetImageRange method is:</p>
367
368<pre class="code">
369 MagickBooleanType GetImageRange(const Image *image,double *minima,
370 double *maxima,ExceptionInfo *exception)
371</pre>
372
373<p>A description of each parameter follows:</p>
374
375<h5>image</h5>
376<p>the image.</p>
377
378<h5>minima</h5>
379<p>the minimum value in the channel.</p>
380
381<h5>maxima</h5>
382<p>the maximum value in the channel.</p>
383
384<h5>exception</h5>
385<p>return any errors or warnings in this structure.</p>
386
387 </div>
388<h2><a href="http://www.imagemagick.org/api/MagickCore/statistic_8c.html" id="GetImageStatistics">GetImageStatistics</a></h2>
389<div class="doc-section">
390
391<p>GetImageStatistics() returns statistics for each channel in the image. The statistics include the channel depth, its minima, maxima, mean, standard deviation, kurtosis and skewness. You can access the red channel mean, for example, like this:</p>
cristy6f77f692011-02-15 15:31:39 +0000[diff] [blame]392
393<pre class="text">
cristy0f7728a2011-07-08 16:51:28 +0000[diff] [blame]394 channel_statistics=GetImageStatistics(image,exception);
cristy6f77f692011-02-15 15:31:39 +0000[diff] [blame]395 red_mean=channel_statistics[RedChannel].mean;
396</pre>
397
398<p>Use MagickRelinquishMemory() to free the statistics buffer.</p>
399
cristy0f7728a2011-07-08 16:51:28 +0000[diff] [blame]400<p>The format of the GetImageStatistics method is:</p>
cristy6f77f692011-02-15 15:31:39 +0000[diff] [blame]401
402<pre class="code">
cristy0f7728a2011-07-08 16:51:28 +0000[diff] [blame]403 ChannelStatistics *GetImageStatistics(const Image *image,
cristy6f77f692011-02-15 15:31:39 +0000[diff] [blame]404 ExceptionInfo *exception)
405</pre>
406
407<p>A description of each parameter follows:</p>
408
409<h5>image</h5>
410<p>the image.</p>
411
412<h5>exception</h5>
413<p>return any errors or warnings in this structure.</p>
414
415 </div>
cristy3eaa0ef2010-03-06 20:35:26 +0000[diff] [blame]416
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