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208
209<div class="main">
210
cristy350dea42011-02-15 17:31:04 +0000[diff] [blame]211<h1>Module statistic Methods</h1>
cristy6f77f692011-02-15 15:31:39 +0000[diff] [blame]212<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]213
cristy350dea42011-02-15 17:31:04 +0000[diff] [blame]214<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]215<div class="doc-section">
216
217<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>
218
219<p>The format of the EvaluateImageChannel method is:</p>
220
221<pre class="code">
222 MagickBooleanType EvaluateImage(Image *image,
223 const MagickEvaluateOperator op,const double value,
224 ExceptionInfo *exception)
225 MagickBooleanType EvaluateImages(Image *images,
226 const MagickEvaluateOperator op,const double value,
227 ExceptionInfo *exception)
228 MagickBooleanType EvaluateImageChannel(Image *image,
229 const ChannelType channel,const MagickEvaluateOperator op,
230 const double value,ExceptionInfo *exception)
231</pre>
232
233<p>A description of each parameter follows:</p>
234
235<h5>image</h5>
236<p>the image.</p>
237
238<h5>channel</h5>
239<p>the channel.</p>
240
241<h5>op</h5>
242<p>A channel op.</p>
243
244<h5>value</h5>
245<p>A value value.</p>
246
247<h5>exception</h5>
248<p>return any errors or warnings in this structure.</p>
249
250 </div>
cristy350dea42011-02-15 17:31:04 +0000[diff] [blame]251<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]252<div class="doc-section">
253
254<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>
255
256<p>The format of the FunctionImageChannel method is:</p>
257
258<pre class="code">
259 MagickBooleanType FunctionImage(Image *image,
260 const MagickFunction function,const ssize_t number_parameters,
261 const double *parameters,ExceptionInfo *exception)
262 MagickBooleanType FunctionImageChannel(Image *image,
263 const ChannelType channel,const MagickFunction function,
264 const ssize_t number_parameters,const double *argument,
265 ExceptionInfo *exception)
266</pre>
267
268<p>A description of each parameter follows:</p>
269
270<h5>image</h5>
271<p>the image.</p>
272
273<h5>channel</h5>
274<p>the channel.</p>
275
276<h5>function</h5>
277<p>A channel function.</p>
278
279<h5>parameters</h5>
280<p>one or more parameters.</p>
281
282<h5>exception</h5>
283<p>return any errors or warnings in this structure.</p>
284
285 </div>
cristy350dea42011-02-15 17:31:04 +0000[diff] [blame]286<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]287<div class="doc-section">
288
289<p>GetImageChannelMean() returns the mean and standard deviation of one or more image channels.</p>
290
291<p>The format of the GetImageChannelMean method is:</p>
292
293<pre class="code">
294 MagickBooleanType GetImageChannelMean(const Image *image,
295 const ChannelType channel,double *mean,double *standard_deviation,
296 ExceptionInfo *exception)
297</pre>
298
299<p>A description of each parameter follows:</p>
300
301<h5>image</h5>
302<p>the image.</p>
303
304<h5>channel</h5>
305<p>the channel.</p>
306
307<h5>mean</h5>
308<p>the average value in the channel.</p>
309
310<h5>standard_deviation</h5>
311<p>the standard deviation of the channel.</p>
312
313<h5>exception</h5>
314<p>return any errors or warnings in this structure.</p>
315
316 </div>
cristy350dea42011-02-15 17:31:04 +0000[diff] [blame]317<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]318<div class="doc-section">
319
320<p>GetImageChannelKurtosis() returns the kurtosis and skewness of one or more image channels.</p>
321
322<p>The format of the GetImageChannelKurtosis method is:</p>
323
324<pre class="code">
325 MagickBooleanType GetImageChannelKurtosis(const Image *image,
326 const ChannelType channel,double *kurtosis,double *skewness,
327 ExceptionInfo *exception)
328</pre>
329
330<p>A description of each parameter follows:</p>
331
332<h5>image</h5>
333<p>the image.</p>
334
335<h5>channel</h5>
336<p>the channel.</p>
337
338<h5>kurtosis</h5>
339<p>the kurtosis of the channel.</p>
340
341<h5>skewness</h5>
342<p>the skewness of the channel.</p>
343
344<h5>exception</h5>
345<p>return any errors or warnings in this structure.</p>
346
347 </div>
cristy350dea42011-02-15 17:31:04 +0000[diff] [blame]348<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]349<div class="doc-section">
350
351<p>GetImageChannelRange() returns the range of one or more image channels.</p>
352
353<p>The format of the GetImageChannelRange method is:</p>
354
355<pre class="code">
356 MagickBooleanType GetImageChannelRange(const Image *image,
357 const ChannelType channel,double *minima,double *maxima,
358 ExceptionInfo *exception)
359</pre>
360
361<p>A description of each parameter follows:</p>
362
363<h5>image</h5>
364<p>the image.</p>
365
366<h5>channel</h5>
367<p>the channel.</p>
368
369<h5>minima</h5>
370<p>the minimum value in the channel.</p>
371
372<h5>maxima</h5>
373<p>the maximum value in the channel.</p>
374
375<h5>exception</h5>
376<p>return any errors or warnings in this structure.</p>
377
378 </div>
cristy350dea42011-02-15 17:31:04 +0000[diff] [blame]379<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]380<div class="doc-section">
381
382<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>
383
384<pre class="text">
385 channel_statistics=GetImageChannelStatistics(image,exception);
386 red_mean=channel_statistics[RedChannel].mean;
387</pre>
388
389<p>Use MagickRelinquishMemory() to free the statistics buffer.</p>
390
391<p>The format of the GetImageChannelStatistics method is:</p>
392
393<pre class="code">
394 ChannelStatistics *GetImageChannelStatistics(const Image *image,
395 ExceptionInfo *exception)
396</pre>
397
398<p>A description of each parameter follows:</p>
399
400<h5>image</h5>
401<p>the image.</p>
402
403<h5>exception</h5>
404<p>return any errors or warnings in this structure.</p>
405
406 </div>
cristy3eaa0ef2010-03-06 20:35:26 +0000[diff] [blame]407
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