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191<div class="main">
192
cristy350dea42011-02-15 17:31:04 +0000[diff] [blame^]193<h1>Module statistic Methods</h1>
cristy6f77f692011-02-15 15:31:39 +0000[diff] [blame]194<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]195
cristy350dea42011-02-15 17:31:04 +0000[diff] [blame^]196<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]197<div class="doc-section">
198
199<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>
200
201<p>The format of the EvaluateImageChannel method is:</p>
202
203<pre class="code">
204 MagickBooleanType EvaluateImage(Image *image,
205 const MagickEvaluateOperator op,const double value,
206 ExceptionInfo *exception)
207 MagickBooleanType EvaluateImages(Image *images,
208 const MagickEvaluateOperator op,const double value,
209 ExceptionInfo *exception)
210 MagickBooleanType EvaluateImageChannel(Image *image,
211 const ChannelType channel,const MagickEvaluateOperator op,
212 const double value,ExceptionInfo *exception)
213</pre>
214
215<p>A description of each parameter follows:</p>
216
217<h5>image</h5>
218<p>the image.</p>
219
220<h5>channel</h5>
221<p>the channel.</p>
222
223<h5>op</h5>
224<p>A channel op.</p>
225
226<h5>value</h5>
227<p>A value value.</p>
228
229<h5>exception</h5>
230<p>return any errors or warnings in this structure.</p>
231
232 </div>
cristy350dea42011-02-15 17:31:04 +0000[diff] [blame^]233<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]234<div class="doc-section">
235
236<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>
237
238<p>The format of the FunctionImageChannel method is:</p>
239
240<pre class="code">
241 MagickBooleanType FunctionImage(Image *image,
242 const MagickFunction function,const ssize_t number_parameters,
243 const double *parameters,ExceptionInfo *exception)
244 MagickBooleanType FunctionImageChannel(Image *image,
245 const ChannelType channel,const MagickFunction function,
246 const ssize_t number_parameters,const double *argument,
247 ExceptionInfo *exception)
248</pre>
249
250<p>A description of each parameter follows:</p>
251
252<h5>image</h5>
253<p>the image.</p>
254
255<h5>channel</h5>
256<p>the channel.</p>
257
258<h5>function</h5>
259<p>A channel function.</p>
260
261<h5>parameters</h5>
262<p>one or more parameters.</p>
263
264<h5>exception</h5>
265<p>return any errors or warnings in this structure.</p>
266
267 </div>
cristy350dea42011-02-15 17:31:04 +0000[diff] [blame^]268<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]269<div class="doc-section">
270
271<p>GetImageChannelMean() returns the mean and standard deviation of one or more image channels.</p>
272
273<p>The format of the GetImageChannelMean method is:</p>
274
275<pre class="code">
276 MagickBooleanType GetImageChannelMean(const Image *image,
277 const ChannelType channel,double *mean,double *standard_deviation,
278 ExceptionInfo *exception)
279</pre>
280
281<p>A description of each parameter follows:</p>
282
283<h5>image</h5>
284<p>the image.</p>
285
286<h5>channel</h5>
287<p>the channel.</p>
288
289<h5>mean</h5>
290<p>the average value in the channel.</p>
291
292<h5>standard_deviation</h5>
293<p>the standard deviation of the channel.</p>
294
295<h5>exception</h5>
296<p>return any errors or warnings in this structure.</p>
297
298 </div>
cristy350dea42011-02-15 17:31:04 +0000[diff] [blame^]299<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]300<div class="doc-section">
301
302<p>GetImageChannelKurtosis() returns the kurtosis and skewness of one or more image channels.</p>
303
304<p>The format of the GetImageChannelKurtosis method is:</p>
305
306<pre class="code">
307 MagickBooleanType GetImageChannelKurtosis(const Image *image,
308 const ChannelType channel,double *kurtosis,double *skewness,
309 ExceptionInfo *exception)
310</pre>
311
312<p>A description of each parameter follows:</p>
313
314<h5>image</h5>
315<p>the image.</p>
316
317<h5>channel</h5>
318<p>the channel.</p>
319
320<h5>kurtosis</h5>
321<p>the kurtosis of the channel.</p>
322
323<h5>skewness</h5>
324<p>the skewness of the channel.</p>
325
326<h5>exception</h5>
327<p>return any errors or warnings in this structure.</p>
328
329 </div>
cristy350dea42011-02-15 17:31:04 +0000[diff] [blame^]330<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]331<div class="doc-section">
332
333<p>GetImageChannelRange() returns the range of one or more image channels.</p>
334
335<p>The format of the GetImageChannelRange method is:</p>
336
337<pre class="code">
338 MagickBooleanType GetImageChannelRange(const Image *image,
339 const ChannelType channel,double *minima,double *maxima,
340 ExceptionInfo *exception)
341</pre>
342
343<p>A description of each parameter follows:</p>
344
345<h5>image</h5>
346<p>the image.</p>
347
348<h5>channel</h5>
349<p>the channel.</p>
350
351<h5>minima</h5>
352<p>the minimum value in the channel.</p>
353
354<h5>maxima</h5>
355<p>the maximum value in the channel.</p>
356
357<h5>exception</h5>
358<p>return any errors or warnings in this structure.</p>
359
360 </div>
cristy350dea42011-02-15 17:31:04 +0000[diff] [blame^]361<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]362<div class="doc-section">
363
364<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>
365
366<pre class="text">
367 channel_statistics=GetImageChannelStatistics(image,exception);
368 red_mean=channel_statistics[RedChannel].mean;
369</pre>
370
371<p>Use MagickRelinquishMemory() to free the statistics buffer.</p>
372
373<p>The format of the GetImageChannelStatistics method is:</p>
374
375<pre class="code">
376 ChannelStatistics *GetImageChannelStatistics(const Image *image,
377 ExceptionInfo *exception)
378</pre>
379
380<p>A description of each parameter follows:</p>
381
382<h5>image</h5>
383<p>the image.</p>
384
385<h5>exception</h5>
386<p>return any errors or warnings in this structure.</p>
387
388 </div>
cristy3eaa0ef2010-03-06 20:35:26 +0000[diff] [blame]389
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