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173 <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>
175 <h2><a href="http://www.imagemagick.org/api/MagickCore/statistic
176 _8c.html" target="source" name="EvaluateImage">EvaluateImage</a></h2>
177 <div class="doc-section">
179 <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>
181 <p>The format of the EvaluateImageChannel method is:</p>
184 MagickBooleanType EvaluateImage(Image *image,
185 const MagickEvaluateOperator op,const double value,
186 ExceptionInfo *exception)
187 MagickBooleanType EvaluateImages(Image *images,
188 const MagickEvaluateOperator op,const double value,
189 ExceptionInfo *exception)
190 MagickBooleanType EvaluateImageChannel(Image *image,
191 const ChannelType channel,const MagickEvaluateOperator op,
192 const double value,ExceptionInfo *exception)
195 <p>A description of each parameter follows:</p></ol>
198 <ol><p>the image.</p></ol>
201 <ol><p>the channel.</p></ol>
204 <ol><p>A channel op.</p></ol>
207 <ol><p>A value value.</p></ol>
210 <ol><p>return any errors or warnings in this structure.</p></ol>
213 <h2><a href="http://www.imagemagick.org/api/MagickCore/statistic
214 _8c.html" target="source" name="FunctionImage">FunctionImage</a></h2>
215 <div class="doc-section">
217 <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>
219 <p>The format of the FunctionImageChannel method is:</p>
222 MagickBooleanType FunctionImage(Image *image,
223 const MagickFunction function,const ssize_t number_parameters,
224 const double *parameters,ExceptionInfo *exception)
225 MagickBooleanType FunctionImageChannel(Image *image,
226 const ChannelType channel,const MagickFunction function,
227 const ssize_t number_parameters,const double *argument,
228 ExceptionInfo *exception)
231 <p>A description of each parameter follows:</p></ol>
234 <ol><p>the image.</p></ol>
237 <ol><p>the channel.</p></ol>
240 <ol><p>A channel function.</p></ol>
243 <ol><p>one or more parameters.</p></ol>
246 <ol><p>return any errors or warnings in this structure.</p></ol>
249 <h2><a href="http://www.imagemagick.org/api/MagickCore/statistic
250 _8c.html" target="source" name="GetImageChannelMean">GetImageChannelMean</a></h2>
251 <div class="doc-section">
253 <p>GetImageChannelMean() returns the mean and standard deviation of one or more image channels.</p></ol>
255 <p>The format of the GetImageChannelMean method is:</p>
258 MagickBooleanType GetImageChannelMean(const Image *image,
259 const ChannelType channel,double *mean,double *standard_deviation,
260 ExceptionInfo *exception)
263 <p>A description of each parameter follows:</p></ol>
266 <ol><p>the image.</p></ol>
269 <ol><p>the channel.</p></ol>
272 <ol><p>the average value in the channel.</p></ol>
274 <h5>standard_deviation</h5>
275 <ol><p>the standard deviation of the channel.</p></ol>
278 <ol><p>return any errors or warnings in this structure.</p></ol>
281 <h2><a href="http://www.imagemagick.org/api/MagickCore/statistic
282 _8c.html" target="source" name="GetImageChannelKurtosis">GetImageChannelKurtosis</a></h2>
283 <div class="doc-section">
285 <p>GetImageChannelKurtosis() returns the kurtosis and skewness of one or more image channels.</p></ol>
287 <p>The format of the GetImageChannelKurtosis method is:</p>
290 MagickBooleanType GetImageChannelKurtosis(const Image *image,
291 const ChannelType channel,double *kurtosis,double *skewness,
292 ExceptionInfo *exception)
295 <p>A description of each parameter follows:</p></ol>
298 <ol><p>the image.</p></ol>
301 <ol><p>the channel.</p></ol>
304 <ol><p>the kurtosis of the channel.</p></ol>
307 <ol><p>the skewness of the channel.</p></ol>
310 <ol><p>return any errors or warnings in this structure.</p></ol>
313 <h2><a href="http://www.imagemagick.org/api/MagickCore/statistic
314 _8c.html" target="source" name="GetImageChannelRange">GetImageChannelRange</a></h2>
315 <div class="doc-section">
317 <p>GetImageChannelRange() returns the range of one or more image channels.</p></ol>
319 <p>The format of the GetImageChannelRange method is:</p>
322 MagickBooleanType GetImageChannelRange(const Image *image,
323 const ChannelType channel,double *minima,double *maxima,
324 ExceptionInfo *exception)
327 <p>A description of each parameter follows:</p></ol>
330 <ol><p>the image.</p></ol>
333 <ol><p>the channel.</p></ol>
336 <ol><p>the minimum value in the channel.</p></ol>
339 <ol><p>the maximum value in the channel.</p></ol>
342 <ol><p>return any errors or warnings in this structure.</p></ol>
345 <h2><a href="http://www.imagemagick.org/api/MagickCore/statistic
346 _8c.html" target="source" name="GetImageChannelStatistics">GetImageChannelStatistics</a></h2>
347 <div class="doc-section">
349 <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>
352 channel_statistics=GetImageChannelStatistics(image,excepton);
353 red_mean=channel_statistics[RedChannel].mean;
356 <p>Use MagickRelinquishMemory() to free the statistics buffer.</p></ol>
358 <p>The format of the GetImageChannelStatistics method is:</p>
361 ChannelStatistics *GetImageChannelStatistics(const Image *image,
362 ExceptionInfo *exception)
365 <p>A description of each parameter follows:</p></ol>
368 <ol><p>the image.</p></ol>
371 <ol><p>return any errors or warnings in this structure.</p></ol>
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