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<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>
<h2><a href="http://www.imagemagick.org/api/MagickCore/statistic
_8c.html" target="source" name="EvaluateImage">EvaluateImage</a></h2>
<div class="doc-section">
<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>
<p>The format of the EvaluateImageChannel method is:</p>
<pre class="code">
MagickBooleanType EvaluateImage(Image *image,
const MagickEvaluateOperator op,const double value,
ExceptionInfo *exception)
MagickBooleanType EvaluateImages(Image *images,
const MagickEvaluateOperator op,const double value,
ExceptionInfo *exception)
MagickBooleanType EvaluateImageChannel(Image *image,
const ChannelType channel,const MagickEvaluateOperator op,
const double value,ExceptionInfo *exception)
</pre>
<p>A description of each parameter follows:</p></ol>
<h5>image</h5>
<ol><p>the image.</p></ol>
<h5>channel</h5>
<ol><p>the channel.</p></ol>
<h5>op</h5>
<ol><p>A channel op.</p></ol>
<h5>value</h5>
<ol><p>A value value.</p></ol>
<h5>exception</h5>
<ol><p>return any errors or warnings in this structure.</p></ol>
</div>
<h2><a href="http://www.imagemagick.org/api/MagickCore/statistic
_8c.html" target="source" name="FunctionImage">FunctionImage</a></h2>
<div class="doc-section">
<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>
<p>The format of the FunctionImageChannel method is:</p>
<pre class="code">
MagickBooleanType FunctionImage(Image *image,
const MagickFunction function,const long number_parameters,
const double *parameters,ExceptionInfo *exception)
MagickBooleanType FunctionImageChannel(Image *image,
const ChannelType channel,const MagickFunction function,
const long number_parameters,const double *argument,
ExceptionInfo *exception)
</pre>
<p>A description of each parameter follows:</p></ol>
<h5>image</h5>
<ol><p>the image.</p></ol>
<h5>channel</h5>
<ol><p>the channel.</p></ol>
<h5>function</h5>
<ol><p>A channel function.</p></ol>
<h5>parameters</h5>
<ol><p>one or more parameters.</p></ol>
<h5>exception</h5>
<ol><p>return any errors or warnings in this structure.</p></ol>
</div>
<h2><a href="http://www.imagemagick.org/api/MagickCore/statistic
_8c.html" target="source" name="GetImageChannelMean">GetImageChannelMean</a></h2>
<div class="doc-section">
<p>GetImageChannelMean() returns the mean and standard deviation of one or more image channels.</p></ol>
<p>The format of the GetImageChannelMean method is:</p>
<pre class="code">
MagickBooleanType GetImageChannelMean(const Image *image,
const ChannelType channel,double *mean,double *standard_deviation,
ExceptionInfo *exception)
</pre>
<p>A description of each parameter follows:</p></ol>
<h5>image</h5>
<ol><p>the image.</p></ol>
<h5>channel</h5>
<ol><p>the channel.</p></ol>
<h5>mean</h5>
<ol><p>the average value in the channel.</p></ol>
<h5>standard_deviation</h5>
<ol><p>the standard deviation of the channel.</p></ol>
<h5>exception</h5>
<ol><p>return any errors or warnings in this structure.</p></ol>
</div>
<h2><a href="http://www.imagemagick.org/api/MagickCore/statistic
_8c.html" target="source" name="GetImageChannelKurtosis">GetImageChannelKurtosis</a></h2>
<div class="doc-section">
<p>GetImageChannelKurtosis() returns the kurtosis and skewness of one or more image channels.</p></ol>
<p>The format of the GetImageChannelKurtosis method is:</p>
<pre class="code">
MagickBooleanType GetImageChannelKurtosis(const Image *image,
const ChannelType channel,double *kurtosis,double *skewness,
ExceptionInfo *exception)
</pre>
<p>A description of each parameter follows:</p></ol>
<h5>image</h5>
<ol><p>the image.</p></ol>
<h5>channel</h5>
<ol><p>the channel.</p></ol>
<h5>kurtosis</h5>
<ol><p>the kurtosis of the channel.</p></ol>
<h5>skewness</h5>
<ol><p>the skewness of the channel.</p></ol>
<h5>exception</h5>
<ol><p>return any errors or warnings in this structure.</p></ol>
</div>
<h2><a href="http://www.imagemagick.org/api/MagickCore/statistic
_8c.html" target="source" name="GetImageChannelRange">GetImageChannelRange</a></h2>
<div class="doc-section">
<p>GetImageChannelRange() returns the range of one or more image channels.</p></ol>
<p>The format of the GetImageChannelRange method is:</p>
<pre class="code">
MagickBooleanType GetImageChannelRange(const Image *image,
const ChannelType channel,double *minima,double *maxima,
ExceptionInfo *exception)
</pre>
<p>A description of each parameter follows:</p></ol>
<h5>image</h5>
<ol><p>the image.</p></ol>
<h5>channel</h5>
<ol><p>the channel.</p></ol>
<h5>minima</h5>
<ol><p>the minimum value in the channel.</p></ol>
<h5>maxima</h5>
<ol><p>the maximum value in the channel.</p></ol>
<h5>exception</h5>
<ol><p>return any errors or warnings in this structure.</p></ol>
</div>
<h2><a href="http://www.imagemagick.org/api/MagickCore/statistic
_8c.html" target="source" name="GetImageChannelStatistics">GetImageChannelStatistics</a></h2>
<div class="doc-section">
<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>
<pre class="text">
channel_statistics=GetImageChannelStatistics(image,excepton);
red_mean=channel_statistics[RedChannel].mean;
</pre>
<p>Use MagickRelinquishMemory() to free the statistics buffer.</p></ol>
<p>The format of the GetImageChannelStatistics method is:</p>
<pre class="code">
ChannelStatistics *GetImageChannelStatistics(const Image *image,
ExceptionInfo *exception)
</pre>
<p>A description of each parameter follows:</p></ol>
<h5>image</h5>
<ol><p>the image.</p></ol>
<h5>exception</h5>
<ol><p>return any errors or warnings in this structure.</p></ol>
</div>
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