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199
200<div class="main">
201
cristy350dea42011-02-15 17:31:04 +0000[diff] [blame]202<h1>Module statistic Methods</h1>
cristy6f77f692011-02-15 15:31:39 +0000[diff] [blame]203<p class="navigation-index">[<a href="#EvaluateImage">EvaluateImage</a> &bull; <a href="#FunctionImage">FunctionImage</a> &bull; <a href="#GetImageChannelMean">GetImageChannelMean</a> &bull; <a href="#GetImageChannelKurtosis">GetImageChannelKurtosis</a> &bull; <a href="#GetImageChannelRange">GetImageChannelRange</a> &bull; <a href="#GetImageChannelStatistics">GetImageChannelStatistics</a>]</p>
cristy3749be42010-02-02 02:46:51 +0000[diff] [blame]204
cristy350dea42011-02-15 17:31:04 +0000[diff] [blame]205<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]206<div class="doc-section">
207
208<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>
209
210<p>The format of the EvaluateImageChannel method is:</p>
211
212<pre class="code">
213 MagickBooleanType EvaluateImage(Image *image,
214 const MagickEvaluateOperator op,const double value,
215 ExceptionInfo *exception)
216 MagickBooleanType EvaluateImages(Image *images,
217 const MagickEvaluateOperator op,const double value,
218 ExceptionInfo *exception)
219 MagickBooleanType EvaluateImageChannel(Image *image,
220 const ChannelType channel,const MagickEvaluateOperator op,
221 const double value,ExceptionInfo *exception)
222</pre>
223
224<p>A description of each parameter follows:</p>
225
226<h5>image</h5>
227<p>the image.</p>
228
229<h5>channel</h5>
230<p>the channel.</p>
231
232<h5>op</h5>
233<p>A channel op.</p>
234
235<h5>value</h5>
236<p>A value value.</p>
237
238<h5>exception</h5>
239<p>return any errors or warnings in this structure.</p>
240
241 </div>
cristy350dea42011-02-15 17:31:04 +0000[diff] [blame]242<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]243<div class="doc-section">
244
245<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>
246
247<p>The format of the FunctionImageChannel method is:</p>
248
249<pre class="code">
250 MagickBooleanType FunctionImage(Image *image,
251 const MagickFunction function,const ssize_t number_parameters,
252 const double *parameters,ExceptionInfo *exception)
253 MagickBooleanType FunctionImageChannel(Image *image,
254 const ChannelType channel,const MagickFunction function,
255 const ssize_t number_parameters,const double *argument,
256 ExceptionInfo *exception)
257</pre>
258
259<p>A description of each parameter follows:</p>
260
261<h5>image</h5>
262<p>the image.</p>
263
264<h5>channel</h5>
265<p>the channel.</p>
266
267<h5>function</h5>
268<p>A channel function.</p>
269
270<h5>parameters</h5>
271<p>one or more parameters.</p>
272
273<h5>exception</h5>
274<p>return any errors or warnings in this structure.</p>
275
276 </div>
cristy350dea42011-02-15 17:31:04 +0000[diff] [blame]277<h2><a href="http://www.imagemagick.org/api/MagickCore/statistic_8c.html" id="GetImageChannelMean">GetImageChannelMean</a></h2>
cristy6f77f692011-02-15 15:31:39 +0000[diff] [blame]278<div class="doc-section">
279
280<p>GetImageChannelMean() returns the mean and standard deviation of one or more image channels.</p>
281
282<p>The format of the GetImageChannelMean method is:</p>
283
284<pre class="code">
285 MagickBooleanType GetImageChannelMean(const Image *image,
286 const ChannelType channel,double *mean,double *standard_deviation,
287 ExceptionInfo *exception)
288</pre>
289
290<p>A description of each parameter follows:</p>
291
292<h5>image</h5>
293<p>the image.</p>
294
295<h5>channel</h5>
296<p>the channel.</p>
297
298<h5>mean</h5>
299<p>the average value in the channel.</p>
300
301<h5>standard_deviation</h5>
302<p>the standard deviation of the channel.</p>
303
304<h5>exception</h5>
305<p>return any errors or warnings in this structure.</p>
306
307 </div>
cristy350dea42011-02-15 17:31:04 +0000[diff] [blame]308<h2><a href="http://www.imagemagick.org/api/MagickCore/statistic_8c.html" id="GetImageChannelKurtosis">GetImageChannelKurtosis</a></h2>
cristy6f77f692011-02-15 15:31:39 +0000[diff] [blame]309<div class="doc-section">
310
311<p>GetImageChannelKurtosis() returns the kurtosis and skewness of one or more image channels.</p>
312
313<p>The format of the GetImageChannelKurtosis method is:</p>
314
315<pre class="code">
316 MagickBooleanType GetImageChannelKurtosis(const Image *image,
317 const ChannelType channel,double *kurtosis,double *skewness,
318 ExceptionInfo *exception)
319</pre>
320
321<p>A description of each parameter follows:</p>
322
323<h5>image</h5>
324<p>the image.</p>
325
326<h5>channel</h5>
327<p>the channel.</p>
328
329<h5>kurtosis</h5>
330<p>the kurtosis of the channel.</p>
331
332<h5>skewness</h5>
333<p>the skewness of the channel.</p>
334
335<h5>exception</h5>
336<p>return any errors or warnings in this structure.</p>
337
338 </div>
cristy350dea42011-02-15 17:31:04 +0000[diff] [blame]339<h2><a href="http://www.imagemagick.org/api/MagickCore/statistic_8c.html" id="GetImageChannelRange">GetImageChannelRange</a></h2>
cristy6f77f692011-02-15 15:31:39 +0000[diff] [blame]340<div class="doc-section">
341
342<p>GetImageChannelRange() returns the range of one or more image channels.</p>
343
344<p>The format of the GetImageChannelRange method is:</p>
345
346<pre class="code">
347 MagickBooleanType GetImageChannelRange(const Image *image,
348 const ChannelType channel,double *minima,double *maxima,
349 ExceptionInfo *exception)
350</pre>
351
352<p>A description of each parameter follows:</p>
353
354<h5>image</h5>
355<p>the image.</p>
356
357<h5>channel</h5>
358<p>the channel.</p>
359
360<h5>minima</h5>
361<p>the minimum value in the channel.</p>
362
363<h5>maxima</h5>
364<p>the maximum value in the channel.</p>
365
366<h5>exception</h5>
367<p>return any errors or warnings in this structure.</p>
368
369 </div>
cristy350dea42011-02-15 17:31:04 +0000[diff] [blame]370<h2><a href="http://www.imagemagick.org/api/MagickCore/statistic_8c.html" id="GetImageChannelStatistics">GetImageChannelStatistics</a></h2>
cristy6f77f692011-02-15 15:31:39 +0000[diff] [blame]371<div class="doc-section">
372
373<p>GetImageChannelStatistics() 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>
374
375<pre class="text">
376 channel_statistics=GetImageChannelStatistics(image,exception);
377 red_mean=channel_statistics[RedChannel].mean;
378</pre>
379
380<p>Use MagickRelinquishMemory() to free the statistics buffer.</p>
381
382<p>The format of the GetImageChannelStatistics method is:</p>
383
384<pre class="code">
385 ChannelStatistics *GetImageChannelStatistics(const Image *image,
386 ExceptionInfo *exception)
387</pre>
388
389<p>A description of each parameter follows:</p>
390
391<h5>image</h5>
392<p>the image.</p>
393
394<h5>exception</h5>
395<p>return any errors or warnings in this structure.</p>
396
397 </div>
cristy3eaa0ef2010-03-06 20:35:26 +0000[diff] [blame]398
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