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167 <p class="navigation-index">[<a href="#EvaluateImage">EvaluateImage</a> • <a href="#FunctionImage">FunctionImage</a> • <a href="#GetImageChannelMean">GetImageChannelMean</a> • <a href="#GetImageChannelKurtosis">GetImageChannelKurtosis</a> • <a href="#GetImageChannelRange">GetImageChannelRange</a> • <a href="#GetImageChannelStatistics">GetImageChannelStatistics</a>]</p>
169 <h2><a href="http://www.imagemagick.org/api/MagickCore/statistic
170 _8c.html" target="source" name="EvaluateImage">EvaluateImage</a></h2>
171 <div class="doc-section">
173 <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></ol>
175 <p>The format of the EvaluateImageChannel method is:</p>
178 MagickBooleanType EvaluateImage(Image *image,
179 const MagickEvaluateOperator op,const double value,
180 ExceptionInfo *exception)
181 MagickBooleanType EvaluateImages(Image *images,
182 const MagickEvaluateOperator op,const double value,
183 ExceptionInfo *exception)
184 MagickBooleanType EvaluateImageChannel(Image *image,
185 const ChannelType channel,const MagickEvaluateOperator op,
186 const double value,ExceptionInfo *exception)
189 <p>A description of each parameter follows:</p></ol>
192 <ol><p>the image.</p></ol>
195 <ol><p>the channel.</p></ol>
198 <ol><p>A channel op.</p></ol>
201 <ol><p>A value value.</p></ol>
204 <ol><p>return any errors or warnings in this structure.</p></ol>
207 <h2><a href="http://www.imagemagick.org/api/MagickCore/statistic
208 _8c.html" target="source" name="FunctionImage">FunctionImage</a></h2>
209 <div class="doc-section">
211 <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></ol>
213 <p>The format of the FunctionImageChannel method is:</p>
216 MagickBooleanType FunctionImage(Image *image,
217 const MagickFunction function,const ssize_t number_parameters,
218 const double *parameters,ExceptionInfo *exception)
219 MagickBooleanType FunctionImageChannel(Image *image,
220 const ChannelType channel,const MagickFunction function,
221 const ssize_t number_parameters,const double *argument,
222 ExceptionInfo *exception)
225 <p>A description of each parameter follows:</p></ol>
228 <ol><p>the image.</p></ol>
231 <ol><p>the channel.</p></ol>
234 <ol><p>A channel function.</p></ol>
237 <ol><p>one or more parameters.</p></ol>
240 <ol><p>return any errors or warnings in this structure.</p></ol>
243 <h2><a href="http://www.imagemagick.org/api/MagickCore/statistic
244 _8c.html" target="source" name="GetImageChannelMean">GetImageChannelMean</a></h2>
245 <div class="doc-section">
247 <p>GetImageChannelMean() returns the mean and standard deviation of one or more image channels.</p></ol>
249 <p>The format of the GetImageChannelMean method is:</p>
252 MagickBooleanType GetImageChannelMean(const Image *image,
253 const ChannelType channel,double *mean,double *standard_deviation,
254 ExceptionInfo *exception)
257 <p>A description of each parameter follows:</p></ol>
260 <ol><p>the image.</p></ol>
263 <ol><p>the channel.</p></ol>
266 <ol><p>the average value in the channel.</p></ol>
268 <h5>standard_deviation</h5>
269 <ol><p>the standard deviation of the channel.</p></ol>
272 <ol><p>return any errors or warnings in this structure.</p></ol>
275 <h2><a href="http://www.imagemagick.org/api/MagickCore/statistic
276 _8c.html" target="source" name="GetImageChannelKurtosis">GetImageChannelKurtosis</a></h2>
277 <div class="doc-section">
279 <p>GetImageChannelKurtosis() returns the kurtosis and skewness of one or more image channels.</p></ol>
281 <p>The format of the GetImageChannelKurtosis method is:</p>
284 MagickBooleanType GetImageChannelKurtosis(const Image *image,
285 const ChannelType channel,double *kurtosis,double *skewness,
286 ExceptionInfo *exception)
289 <p>A description of each parameter follows:</p></ol>
292 <ol><p>the image.</p></ol>
295 <ol><p>the channel.</p></ol>
298 <ol><p>the kurtosis of the channel.</p></ol>
301 <ol><p>the skewness of the channel.</p></ol>
304 <ol><p>return any errors or warnings in this structure.</p></ol>
307 <h2><a href="http://www.imagemagick.org/api/MagickCore/statistic
308 _8c.html" target="source" name="GetImageChannelRange">GetImageChannelRange</a></h2>
309 <div class="doc-section">
311 <p>GetImageChannelRange() returns the range of one or more image channels.</p></ol>
313 <p>The format of the GetImageChannelRange method is:</p>
316 MagickBooleanType GetImageChannelRange(const Image *image,
317 const ChannelType channel,double *minima,double *maxima,
318 ExceptionInfo *exception)
321 <p>A description of each parameter follows:</p></ol>
324 <ol><p>the image.</p></ol>
327 <ol><p>the channel.</p></ol>
330 <ol><p>the minimum value in the channel.</p></ol>
333 <ol><p>the maximum value in the channel.</p></ol>
336 <ol><p>return any errors or warnings in this structure.</p></ol>
339 <h2><a href="http://www.imagemagick.org/api/MagickCore/statistic
340 _8c.html" target="source" name="GetImageChannelStatistics">GetImageChannelStatistics</a></h2>
341 <div class="doc-section">
343 <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>
346 channel_statistics=GetImageChannelStatistics(image,excepton);
347 red_mean=channel_statistics[RedChannel].mean;
350 <p>Use MagickRelinquishMemory() to free the statistics buffer.</p></ol>
352 <p>The format of the GetImageChannelStatistics method is:</p>
355 ChannelStatistics *GetImageChannelStatistics(const Image *image,
356 ExceptionInfo *exception)
359 <p>A description of each parameter follows:</p></ol>
362 <ol><p>the image.</p></ol>
365 <ol><p>return any errors or warnings in this structure.</p></ol>
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