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203</div>
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212<div class="main">
213
cristy350dea42011-02-15 17:31:04 +0000[diff] [blame]214<h1>Module statistic Methods</h1>
cristy0f7728a2011-07-08 16:51:28 +0000[diff] [blame^]215<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]216
cristy350dea42011-02-15 17:31:04 +0000[diff] [blame]217<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]218<div class="doc-section">
219
220<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>
221
cristy0f7728a2011-07-08 16:51:28 +0000[diff] [blame^]222<p>The format of the EvaluateImage method is:</p>
cristy6f77f692011-02-15 15:31:39 +0000[diff] [blame]223
224<pre class="code">
225 MagickBooleanType EvaluateImage(Image *image,
226 const MagickEvaluateOperator op,const double value,
227 ExceptionInfo *exception)
228 MagickBooleanType EvaluateImages(Image *images,
229 const MagickEvaluateOperator op,const double value,
230 ExceptionInfo *exception)
cristy6f77f692011-02-15 15:31:39 +0000[diff] [blame]231</pre>
232
233<p>A description of each parameter follows:</p>
234
235<h5>image</h5>
236<p>the image.</p>
237
cristy6f77f692011-02-15 15:31:39 +0000[diff] [blame]238<h5>op</h5>
239<p>A channel op.</p>
240
241<h5>value</h5>
242<p>A value value.</p>
243
244<h5>exception</h5>
245<p>return any errors or warnings in this structure.</p>
246
247 </div>
cristy350dea42011-02-15 17:31:04 +0000[diff] [blame]248<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]249<div class="doc-section">
250
251<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>
252
cristy0f7728a2011-07-08 16:51:28 +0000[diff] [blame^]253<p>The format of the FunctionImage method is:</p>
cristy6f77f692011-02-15 15:31:39 +0000[diff] [blame]254
255<pre class="code">
256 MagickBooleanType FunctionImage(Image *image,
257 const MagickFunction function,const ssize_t number_parameters,
258 const double *parameters,ExceptionInfo *exception)
cristy6f77f692011-02-15 15:31:39 +0000[diff] [blame]259</pre>
260
261<p>A description of each parameter follows:</p>
262
263<h5>image</h5>
264<p>the image.</p>
265
cristy6f77f692011-02-15 15:31:39 +0000[diff] [blame]266<h5>function</h5>
267<p>A channel function.</p>
268
269<h5>parameters</h5>
270<p>one or more parameters.</p>
271
272<h5>exception</h5>
273<p>return any errors or warnings in this structure.</p>
274
275 </div>
cristy0f7728a2011-07-08 16:51:28 +0000[diff] [blame^]276<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]277<div class="doc-section">
278
cristy0f7728a2011-07-08 16:51:28 +0000[diff] [blame^]279<p>GetImageExtrema() returns the extrema of one or more image channels.</p>
cristy6f77f692011-02-15 15:31:39 +0000[diff] [blame]280
cristy0f7728a2011-07-08 16:51:28 +0000[diff] [blame^]281<p>The format of the GetImageExtrema method is:</p>
cristy6f77f692011-02-15 15:31:39 +0000[diff] [blame]282
283<pre class="code">
cristy0f7728a2011-07-08 16:51:28 +0000[diff] [blame^]284 MagickBooleanType GetImageExtrema(const Image *image,size_t *minima,
285 size_t *maxima,ExceptionInfo *exception)
cristy6f77f692011-02-15 15:31:39 +0000[diff] [blame]286</pre>
287
288<p>A description of each parameter follows:</p>
289
290<h5>image</h5>
291<p>the image.</p>
292
cristy6f77f692011-02-15 15:31:39 +0000[diff] [blame]293<h5>minima</h5>
294<p>the minimum value in the channel.</p>
295
296<h5>maxima</h5>
297<p>the maximum value in the channel.</p>
298
299<h5>exception</h5>
300<p>return any errors or warnings in this structure.</p>
301
302 </div>
cristy0f7728a2011-07-08 16:51:28 +0000[diff] [blame^]303<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]304<div class="doc-section">
305
cristy0f7728a2011-07-08 16:51:28 +0000[diff] [blame^]306<p>GetImageMean() returns the mean and standard deviation of one or more image channels.</p>
307
308<p>The format of the GetImageMean method is:</p>
309
310<pre class="code">
311 MagickBooleanType GetImageMean(const Image *image,double *mean,
312 double *standard_deviation,ExceptionInfo *exception)
313</pre>
314
315<p>A description of each parameter follows:</p>
316
317<h5>image</h5>
318<p>the image.</p>
319
320<h5>mean</h5>
321<p>the average value in the channel.</p>
322
323<h5>standard_deviation</h5>
324<p>the standard deviation of the channel.</p>
325
326<h5>exception</h5>
327<p>return any errors or warnings in this structure.</p>
328
329 </div>
330<h2><a href="http://www.imagemagick.org/api/MagickCore/statistic_8c.html" id="GetImageKurtosis">GetImageKurtosis</a></h2>
331<div class="doc-section">
332
333<p>GetImageKurtosis() returns the kurtosis and skewness of one or more image channels.</p>
334
335<p>The format of the GetImageKurtosis method is:</p>
336
337<pre class="code">
338 MagickBooleanType GetImageKurtosis(const Image *image,double *kurtosis,
339 double *skewness,ExceptionInfo *exception)
340</pre>
341
342<p>A description of each parameter follows:</p>
343
344<h5>image</h5>
345<p>the image.</p>
346
347<h5>kurtosis</h5>
348<p>the kurtosis of the channel.</p>
349
350<h5>skewness</h5>
351<p>the skewness of the channel.</p>
352
353<h5>exception</h5>
354<p>return any errors or warnings in this structure.</p>
355
356 </div>
357<h2><a href="http://www.imagemagick.org/api/MagickCore/statistic_8c.html" id="GetImageRange">GetImageRange</a></h2>
358<div class="doc-section">
359
360<p>GetImageRange() returns the range of one or more image channels.</p>
361
362<p>The format of the GetImageRange method is:</p>
363
364<pre class="code">
365 MagickBooleanType GetImageRange(const Image *image,double *minima,
366 double *maxima,ExceptionInfo *exception)
367</pre>
368
369<p>A description of each parameter follows:</p>
370
371<h5>image</h5>
372<p>the image.</p>
373
374<h5>minima</h5>
375<p>the minimum value in the channel.</p>
376
377<h5>maxima</h5>
378<p>the maximum value in the channel.</p>
379
380<h5>exception</h5>
381<p>return any errors or warnings in this structure.</p>
382
383 </div>
384<h2><a href="http://www.imagemagick.org/api/MagickCore/statistic_8c.html" id="GetImageStatistics">GetImageStatistics</a></h2>
385<div class="doc-section">
386
387<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]388
389<pre class="text">
cristy0f7728a2011-07-08 16:51:28 +0000[diff] [blame^]390 channel_statistics=GetImageStatistics(image,exception);
cristy6f77f692011-02-15 15:31:39 +0000[diff] [blame]391 red_mean=channel_statistics[RedChannel].mean;
392</pre>
393
394<p>Use MagickRelinquishMemory() to free the statistics buffer.</p>
395
cristy0f7728a2011-07-08 16:51:28 +0000[diff] [blame^]396<p>The format of the GetImageStatistics method is:</p>
cristy6f77f692011-02-15 15:31:39 +0000[diff] [blame]397
398<pre class="code">
cristy0f7728a2011-07-08 16:51:28 +0000[diff] [blame^]399 ChannelStatistics *GetImageStatistics(const Image *image,
cristy6f77f692011-02-15 15:31:39 +0000[diff] [blame]400 ExceptionInfo *exception)
401</pre>
402
403<p>A description of each parameter follows:</p>
404
405<h5>image</h5>
406<p>the image.</p>
407
408<h5>exception</h5>
409<p>return any errors or warnings in this structure.</p>
410
411 </div>
cristy3eaa0ef2010-03-06 20:35:26 +0000[diff] [blame]412
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