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195
cristy350dea42011-02-15 17:31:04 +0000[diff] [blame]196<h1>Module statistic Methods</h1>
cristy6f77f692011-02-15 15:31:39 +0000[diff] [blame]197<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]198
cristy350dea42011-02-15 17:31:04 +0000[diff] [blame]199<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]200<div class="doc-section">
201
202<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>
203
204<p>The format of the EvaluateImageChannel method is:</p>
205
206<pre class="code">
207 MagickBooleanType EvaluateImage(Image *image,
208 const MagickEvaluateOperator op,const double value,
209 ExceptionInfo *exception)
210 MagickBooleanType EvaluateImages(Image *images,
211 const MagickEvaluateOperator op,const double value,
212 ExceptionInfo *exception)
213 MagickBooleanType EvaluateImageChannel(Image *image,
214 const ChannelType channel,const MagickEvaluateOperator op,
215 const double value,ExceptionInfo *exception)
216</pre>
217
218<p>A description of each parameter follows:</p>
219
220<h5>image</h5>
221<p>the image.</p>
222
223<h5>channel</h5>
224<p>the channel.</p>
225
226<h5>op</h5>
227<p>A channel op.</p>
228
229<h5>value</h5>
230<p>A value value.</p>
231
232<h5>exception</h5>
233<p>return any errors or warnings in this structure.</p>
234
235 </div>
cristy350dea42011-02-15 17:31:04 +0000[diff] [blame]236<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]237<div class="doc-section">
238
239<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>
240
241<p>The format of the FunctionImageChannel method is:</p>
242
243<pre class="code">
244 MagickBooleanType FunctionImage(Image *image,
245 const MagickFunction function,const ssize_t number_parameters,
246 const double *parameters,ExceptionInfo *exception)
247 MagickBooleanType FunctionImageChannel(Image *image,
248 const ChannelType channel,const MagickFunction function,
249 const ssize_t number_parameters,const double *argument,
250 ExceptionInfo *exception)
251</pre>
252
253<p>A description of each parameter follows:</p>
254
255<h5>image</h5>
256<p>the image.</p>
257
258<h5>channel</h5>
259<p>the channel.</p>
260
261<h5>function</h5>
262<p>A channel function.</p>
263
264<h5>parameters</h5>
265<p>one or more parameters.</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/statistic_8c.html" id="GetImageChannelMean">GetImageChannelMean</a></h2>
cristy6f77f692011-02-15 15:31:39 +0000[diff] [blame]272<div class="doc-section">
273
274<p>GetImageChannelMean() returns the mean and standard deviation of one or more image channels.</p>
275
276<p>The format of the GetImageChannelMean method is:</p>
277
278<pre class="code">
279 MagickBooleanType GetImageChannelMean(const Image *image,
280 const ChannelType channel,double *mean,double *standard_deviation,
281 ExceptionInfo *exception)
282</pre>
283
284<p>A description of each parameter follows:</p>
285
286<h5>image</h5>
287<p>the image.</p>
288
289<h5>channel</h5>
290<p>the channel.</p>
291
292<h5>mean</h5>
293<p>the average value in the channel.</p>
294
295<h5>standard_deviation</h5>
296<p>the standard deviation of the channel.</p>
297
298<h5>exception</h5>
299<p>return any errors or warnings in this structure.</p>
300
301 </div>
cristy350dea42011-02-15 17:31:04 +0000[diff] [blame]302<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]303<div class="doc-section">
304
305<p>GetImageChannelKurtosis() returns the kurtosis and skewness of one or more image channels.</p>
306
307<p>The format of the GetImageChannelKurtosis method is:</p>
308
309<pre class="code">
310 MagickBooleanType GetImageChannelKurtosis(const Image *image,
311 const ChannelType channel,double *kurtosis,double *skewness,
312 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>channel</h5>
321<p>the channel.</p>
322
323<h5>kurtosis</h5>
324<p>the kurtosis of the channel.</p>
325
326<h5>skewness</h5>
327<p>the skewness of the channel.</p>
328
329<h5>exception</h5>
330<p>return any errors or warnings in this structure.</p>
331
332 </div>
cristy350dea42011-02-15 17:31:04 +0000[diff] [blame]333<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]334<div class="doc-section">
335
336<p>GetImageChannelRange() returns the range of one or more image channels.</p>
337
338<p>The format of the GetImageChannelRange method is:</p>
339
340<pre class="code">
341 MagickBooleanType GetImageChannelRange(const Image *image,
342 const ChannelType channel,double *minima,double *maxima,
343 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>channel</h5>
352<p>the channel.</p>
353
354<h5>minima</h5>
355<p>the minimum value in the channel.</p>
356
357<h5>maxima</h5>
358<p>the maximum value in the channel.</p>
359
360<h5>exception</h5>
361<p>return any errors or warnings in this structure.</p>
362
363 </div>
cristy350dea42011-02-15 17:31:04 +0000[diff] [blame]364<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]365<div class="doc-section">
366
367<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>
368
369<pre class="text">
370 channel_statistics=GetImageChannelStatistics(image,exception);
371 red_mean=channel_statistics[RedChannel].mean;
372</pre>
373
374<p>Use MagickRelinquishMemory() to free the statistics buffer.</p>
375
376<p>The format of the GetImageChannelStatistics method is:</p>
377
378<pre class="code">
379 ChannelStatistics *GetImageChannelStatistics(const Image *image,
380 ExceptionInfo *exception)
381</pre>
382
383<p>A description of each parameter follows:</p>
384
385<h5>image</h5>
386<p>the image.</p>
387
388<h5>exception</h5>
389<p>return any errors or warnings in this structure.</p>
390
391 </div>
cristy3eaa0ef2010-03-06 20:35:26 +0000[diff] [blame]392
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