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211
212<div class="main">
213
cristy350dea42011-02-15 17:31:04 +0000[diff] [blame]214<h1>Module statistic Methods</h1>
cristy6f77f692011-02-15 15:31:39 +0000[diff] [blame]215<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]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
222<p>The format of the EvaluateImageChannel method is:</p>
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)
231 MagickBooleanType EvaluateImageChannel(Image *image,
232 const ChannelType channel,const MagickEvaluateOperator op,
233 const double value,ExceptionInfo *exception)
234</pre>
235
236<p>A description of each parameter follows:</p>
237
238<h5>image</h5>
239<p>the image.</p>
240
241<h5>channel</h5>
242<p>the channel.</p>
243
244<h5>op</h5>
245<p>A channel op.</p>
246
247<h5>value</h5>
248<p>A value value.</p>
249
250<h5>exception</h5>
251<p>return any errors or warnings in this structure.</p>
252
253 </div>
cristy350dea42011-02-15 17:31:04 +0000[diff] [blame]254<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]255<div class="doc-section">
256
257<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>
258
259<p>The format of the FunctionImageChannel method is:</p>
260
261<pre class="code">
262 MagickBooleanType FunctionImage(Image *image,
263 const MagickFunction function,const ssize_t number_parameters,
264 const double *parameters,ExceptionInfo *exception)
265 MagickBooleanType FunctionImageChannel(Image *image,
266 const ChannelType channel,const MagickFunction function,
267 const ssize_t number_parameters,const double *argument,
268 ExceptionInfo *exception)
269</pre>
270
271<p>A description of each parameter follows:</p>
272
273<h5>image</h5>
274<p>the image.</p>
275
276<h5>channel</h5>
277<p>the channel.</p>
278
279<h5>function</h5>
280<p>A channel function.</p>
281
282<h5>parameters</h5>
283<p>one or more parameters.</p>
284
285<h5>exception</h5>
286<p>return any errors or warnings in this structure.</p>
287
288 </div>
cristy350dea42011-02-15 17:31:04 +0000[diff] [blame]289<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]290<div class="doc-section">
291
292<p>GetImageChannelMean() returns the mean and standard deviation of one or more image channels.</p>
293
294<p>The format of the GetImageChannelMean method is:</p>
295
296<pre class="code">
297 MagickBooleanType GetImageChannelMean(const Image *image,
298 const ChannelType channel,double *mean,double *standard_deviation,
299 ExceptionInfo *exception)
300</pre>
301
302<p>A description of each parameter follows:</p>
303
304<h5>image</h5>
305<p>the image.</p>
306
307<h5>channel</h5>
308<p>the channel.</p>
309
310<h5>mean</h5>
311<p>the average value in the channel.</p>
312
313<h5>standard_deviation</h5>
314<p>the standard deviation of the channel.</p>
315
316<h5>exception</h5>
317<p>return any errors or warnings in this structure.</p>
318
319 </div>
cristy350dea42011-02-15 17:31:04 +0000[diff] [blame]320<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]321<div class="doc-section">
322
323<p>GetImageChannelKurtosis() returns the kurtosis and skewness of one or more image channels.</p>
324
325<p>The format of the GetImageChannelKurtosis method is:</p>
326
327<pre class="code">
328 MagickBooleanType GetImageChannelKurtosis(const Image *image,
329 const ChannelType channel,double *kurtosis,double *skewness,
330 ExceptionInfo *exception)
331</pre>
332
333<p>A description of each parameter follows:</p>
334
335<h5>image</h5>
336<p>the image.</p>
337
338<h5>channel</h5>
339<p>the channel.</p>
340
341<h5>kurtosis</h5>
342<p>the kurtosis of the channel.</p>
343
344<h5>skewness</h5>
345<p>the skewness of the channel.</p>
346
347<h5>exception</h5>
348<p>return any errors or warnings in this structure.</p>
349
350 </div>
cristy350dea42011-02-15 17:31:04 +0000[diff] [blame]351<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]352<div class="doc-section">
353
354<p>GetImageChannelRange() returns the range of one or more image channels.</p>
355
356<p>The format of the GetImageChannelRange method is:</p>
357
358<pre class="code">
359 MagickBooleanType GetImageChannelRange(const Image *image,
360 const ChannelType channel,double *minima,double *maxima,
361 ExceptionInfo *exception)
362</pre>
363
364<p>A description of each parameter follows:</p>
365
366<h5>image</h5>
367<p>the image.</p>
368
369<h5>channel</h5>
370<p>the channel.</p>
371
372<h5>minima</h5>
373<p>the minimum value in the channel.</p>
374
375<h5>maxima</h5>
376<p>the maximum value in the channel.</p>
377
378<h5>exception</h5>
379<p>return any errors or warnings in this structure.</p>
380
381 </div>
cristy350dea42011-02-15 17:31:04 +0000[diff] [blame]382<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]383<div class="doc-section">
384
385<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>
386
387<pre class="text">
388 channel_statistics=GetImageChannelStatistics(image,exception);
389 red_mean=channel_statistics[RedChannel].mean;
390</pre>
391
392<p>Use MagickRelinquishMemory() to free the statistics buffer.</p>
393
394<p>The format of the GetImageChannelStatistics method is:</p>
395
396<pre class="code">
397 ChannelStatistics *GetImageChannelStatistics(const Image *image,
398 ExceptionInfo *exception)
399</pre>
400
401<p>A description of each parameter follows:</p>
402
403<h5>image</h5>
404<p>the image.</p>
405
406<h5>exception</h5>
407<p>return any errors or warnings in this structure.</p>
408
409 </div>
cristy3eaa0ef2010-03-06 20:35:26 +0000[diff] [blame]410
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