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155 <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>
157 <h2><a href="http://www.imagemagick.org/api/MagickCore/statistic
158 _8c.html" target="source" name="EvaluateImage">EvaluateImage</a></h2>
159 <div class="doc-section">
161 <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>
163 <p>The format of the EvaluateImageChannel method is:</p>
166 MagickBooleanType EvaluateImage(Image *image,
167 const MagickEvaluateOperator op,const double value,
168 ExceptionInfo *exception)
169 MagickBooleanType EvaluateImages(Image *images,
170 const MagickEvaluateOperator op,const double value,
171 ExceptionInfo *exception)
172 MagickBooleanType EvaluateImageChannel(Image *image,
173 const ChannelType channel,const MagickEvaluateOperator op,
174 const double value,ExceptionInfo *exception)
177 <p>A description of each parameter follows:</p></ol>
180 <ol><p>the image.</p></ol>
183 <ol><p>the channel.</p></ol>
186 <ol><p>A channel op.</p></ol>
189 <ol><p>A value value.</p></ol>
192 <ol><p>return any errors or warnings in this structure.</p></ol>
195 <h2><a href="http://www.imagemagick.org/api/MagickCore/statistic
196 _8c.html" target="source" name="FunctionImage">FunctionImage</a></h2>
197 <div class="doc-section">
199 <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>
201 <p>The format of the FunctionImageChannel method is:</p>
204 MagickBooleanType FunctionImage(Image *image,
205 const MagickFunction function,const long number_parameters,
206 const double *parameters,ExceptionInfo *exception)
207 MagickBooleanType FunctionImageChannel(Image *image,
208 const ChannelType channel,const MagickFunction function,
209 const long number_parameters,const double *argument,
210 ExceptionInfo *exception)
213 <p>A description of each parameter follows:</p></ol>
216 <ol><p>the image.</p></ol>
219 <ol><p>the channel.</p></ol>
222 <ol><p>A channel function.</p></ol>
225 <ol><p>one or more parameters.</p></ol>
228 <ol><p>return any errors or warnings in this structure.</p></ol>
231 <h2><a href="http://www.imagemagick.org/api/MagickCore/statistic
232 _8c.html" target="source" name="GetImageChannelMean">GetImageChannelMean</a></h2>
233 <div class="doc-section">
235 <p>GetImageChannelMean() returns the mean and standard deviation of one or more image channels.</p></ol>
237 <p>The format of the GetImageChannelMean method is:</p>
240 MagickBooleanType GetImageChannelMean(const Image *image,
241 const ChannelType channel,double *mean,double *standard_deviation,
242 ExceptionInfo *exception)
245 <p>A description of each parameter follows:</p></ol>
248 <ol><p>the image.</p></ol>
251 <ol><p>the channel.</p></ol>
254 <ol><p>the average value in the channel.</p></ol>
256 <h5>standard_deviation</h5>
257 <ol><p>the standard deviation of the channel.</p></ol>
260 <ol><p>return any errors or warnings in this structure.</p></ol>
263 <h2><a href="http://www.imagemagick.org/api/MagickCore/statistic
264 _8c.html" target="source" name="GetImageChannelKurtosis">GetImageChannelKurtosis</a></h2>
265 <div class="doc-section">
267 <p>GetImageChannelKurtosis() returns the kurtosis and skewness of one or more image channels.</p></ol>
269 <p>The format of the GetImageChannelKurtosis method is:</p>
272 MagickBooleanType GetImageChannelKurtosis(const Image *image,
273 const ChannelType channel,double *kurtosis,double *skewness,
274 ExceptionInfo *exception)
277 <p>A description of each parameter follows:</p></ol>
280 <ol><p>the image.</p></ol>
283 <ol><p>the channel.</p></ol>
286 <ol><p>the kurtosis of the channel.</p></ol>
289 <ol><p>the skewness of the channel.</p></ol>
292 <ol><p>return any errors or warnings in this structure.</p></ol>
295 <h2><a href="http://www.imagemagick.org/api/MagickCore/statistic
296 _8c.html" target="source" name="GetImageChannelRange">GetImageChannelRange</a></h2>
297 <div class="doc-section">
299 <p>GetImageChannelRange() returns the range of one or more image channels.</p></ol>
301 <p>The format of the GetImageChannelRange method is:</p>
304 MagickBooleanType GetImageChannelRange(const Image *image,
305 const ChannelType channel,double *minima,double *maxima,
306 ExceptionInfo *exception)
309 <p>A description of each parameter follows:</p></ol>
312 <ol><p>the image.</p></ol>
315 <ol><p>the channel.</p></ol>
318 <ol><p>the minimum value in the channel.</p></ol>
321 <ol><p>the maximum value in the channel.</p></ol>
324 <ol><p>return any errors or warnings in this structure.</p></ol>
327 <h2><a href="http://www.imagemagick.org/api/MagickCore/statistic
328 _8c.html" target="source" name="GetImageChannelStatistics">GetImageChannelStatistics</a></h2>
329 <div class="doc-section">
331 <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>
334 channel_statistics=GetImageChannelStatistics(image,excepton);
335 red_mean=channel_statistics[RedChannel].mean;
338 <p>Use MagickRelinquishMemory() to free the statistics buffer.</p></ol>
340 <p>The format of the GetImageChannelStatistics method is:</p>
343 ChannelStatistics *GetImageChannelStatistics(const Image *image,
344 ExceptionInfo *exception)
347 <p>A description of each parameter follows:</p></ol>
350 <ol><p>the image.</p></ol>
353 <ol><p>return any errors or warnings in this structure.</p></ol>
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