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215<div class="main">
216
cristy350dea42011-02-15 17:31:04 +0000[diff] [blame]217<h1>Module statistic Methods</h1>
cristy6f77f692011-02-15 15:31:39 +0000[diff] [blame]218<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]219
cristy350dea42011-02-15 17:31:04 +0000[diff] [blame]220<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]221<div class="doc-section">
222
223<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>
224
225<p>The format of the EvaluateImageChannel method is:</p>
226
227<pre class="code">
228 MagickBooleanType EvaluateImage(Image *image,
229 const MagickEvaluateOperator op,const double value,
230 ExceptionInfo *exception)
231 MagickBooleanType EvaluateImages(Image *images,
232 const MagickEvaluateOperator op,const double value,
233 ExceptionInfo *exception)
234 MagickBooleanType EvaluateImageChannel(Image *image,
235 const ChannelType channel,const MagickEvaluateOperator op,
236 const double value,ExceptionInfo *exception)
237</pre>
238
239<p>A description of each parameter follows:</p>
240
241<h5>image</h5>
242<p>the image.</p>
243
244<h5>channel</h5>
245<p>the channel.</p>
246
247<h5>op</h5>
248<p>A channel op.</p>
249
250<h5>value</h5>
251<p>A value value.</p>
252
253<h5>exception</h5>
254<p>return any errors or warnings in this structure.</p>
255
256 </div>
cristy350dea42011-02-15 17:31:04 +0000[diff] [blame]257<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]258<div class="doc-section">
259
260<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>
261
262<p>The format of the FunctionImageChannel method is:</p>
263
264<pre class="code">
265 MagickBooleanType FunctionImage(Image *image,
266 const MagickFunction function,const ssize_t number_parameters,
267 const double *parameters,ExceptionInfo *exception)
268 MagickBooleanType FunctionImageChannel(Image *image,
269 const ChannelType channel,const MagickFunction function,
270 const ssize_t number_parameters,const double *argument,
271 ExceptionInfo *exception)
272</pre>
273
274<p>A description of each parameter follows:</p>
275
276<h5>image</h5>
277<p>the image.</p>
278
279<h5>channel</h5>
280<p>the channel.</p>
281
282<h5>function</h5>
283<p>A channel function.</p>
284
285<h5>parameters</h5>
286<p>one or more parameters.</p>
287
288<h5>exception</h5>
289<p>return any errors or warnings in this structure.</p>
290
291 </div>
cristy350dea42011-02-15 17:31:04 +0000[diff] [blame]292<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]293<div class="doc-section">
294
295<p>GetImageChannelMean() returns the mean and standard deviation of one or more image channels.</p>
296
297<p>The format of the GetImageChannelMean method is:</p>
298
299<pre class="code">
300 MagickBooleanType GetImageChannelMean(const Image *image,
301 const ChannelType channel,double *mean,double *standard_deviation,
302 ExceptionInfo *exception)
303</pre>
304
305<p>A description of each parameter follows:</p>
306
307<h5>image</h5>
308<p>the image.</p>
309
310<h5>channel</h5>
311<p>the channel.</p>
312
313<h5>mean</h5>
314<p>the average value in the channel.</p>
315
316<h5>standard_deviation</h5>
317<p>the standard deviation of the channel.</p>
318
319<h5>exception</h5>
320<p>return any errors or warnings in this structure.</p>
321
322 </div>
cristy350dea42011-02-15 17:31:04 +0000[diff] [blame]323<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]324<div class="doc-section">
325
326<p>GetImageChannelKurtosis() returns the kurtosis and skewness of one or more image channels.</p>
327
328<p>The format of the GetImageChannelKurtosis method is:</p>
329
330<pre class="code">
331 MagickBooleanType GetImageChannelKurtosis(const Image *image,
332 const ChannelType channel,double *kurtosis,double *skewness,
333 ExceptionInfo *exception)
334</pre>
335
336<p>A description of each parameter follows:</p>
337
338<h5>image</h5>
339<p>the image.</p>
340
341<h5>channel</h5>
342<p>the channel.</p>
343
344<h5>kurtosis</h5>
345<p>the kurtosis of the channel.</p>
346
347<h5>skewness</h5>
348<p>the skewness of the channel.</p>
349
350<h5>exception</h5>
351<p>return any errors or warnings in this structure.</p>
352
353 </div>
cristy350dea42011-02-15 17:31:04 +0000[diff] [blame]354<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]355<div class="doc-section">
356
357<p>GetImageChannelRange() returns the range of one or more image channels.</p>
358
359<p>The format of the GetImageChannelRange method is:</p>
360
361<pre class="code">
362 MagickBooleanType GetImageChannelRange(const Image *image,
363 const ChannelType channel,double *minima,double *maxima,
364 ExceptionInfo *exception)
365</pre>
366
367<p>A description of each parameter follows:</p>
368
369<h5>image</h5>
370<p>the image.</p>
371
372<h5>channel</h5>
373<p>the channel.</p>
374
375<h5>minima</h5>
376<p>the minimum value in the channel.</p>
377
378<h5>maxima</h5>
379<p>the maximum value in the channel.</p>
380
381<h5>exception</h5>
382<p>return any errors or warnings in this structure.</p>
383
384 </div>
cristy350dea42011-02-15 17:31:04 +0000[diff] [blame]385<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]386<div class="doc-section">
387
388<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>
389
390<pre class="text">
391 channel_statistics=GetImageChannelStatistics(image,exception);
392 red_mean=channel_statistics[RedChannel].mean;
393</pre>
394
395<p>Use MagickRelinquishMemory() to free the statistics buffer.</p>
396
397<p>The format of the GetImageChannelStatistics method is:</p>
398
399<pre class="code">
400 ChannelStatistics *GetImageChannelStatistics(const Image *image,
401 ExceptionInfo *exception)
402</pre>
403
404<p>A description of each parameter follows:</p>
405
406<h5>image</h5>
407<p>the image.</p>
408
409<h5>exception</h5>
410<p>return any errors or warnings in this structure.</p>
411
412 </div>
cristy3eaa0ef2010-03-06 20:35:26 +0000[diff] [blame]413
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