Module statistic Methods
EvaluateImage
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.
The format of the EvaluateImage method is:
MagickBooleanType EvaluateImage(Image *image, const MagickEvaluateOperator op,const double value, ExceptionInfo *exception) MagickBooleanType EvaluateImages(Image *images, const MagickEvaluateOperator op,const double value, ExceptionInfo *exception)
A description of each parameter follows:
image
the image.
op
A channel op.
value
A value value.
exception
return any errors or warnings in this structure.
FunctionImage
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.
The format of the FunctionImage method is:
MagickBooleanType FunctionImage(Image *image, const MagickFunction function,const ssize_t number_parameters, const double *parameters,ExceptionInfo *exception)
A description of each parameter follows:
image
the image.
function
A channel function.
parameters
one or more parameters.
exception
return any errors or warnings in this structure.
GetImageExtrema
GetImageExtrema() returns the extrema of one or more image channels.
The format of the GetImageExtrema method is:
MagickBooleanType GetImageExtrema(const Image *image,size_t *minima, size_t *maxima,ExceptionInfo *exception)
A description of each parameter follows:
image
the image.
minima
the minimum value in the channel.
maxima
the maximum value in the channel.
exception
return any errors or warnings in this structure.
GetImageMean
GetImageMean() returns the mean and standard deviation of one or more image channels.
The format of the GetImageMean method is:
MagickBooleanType GetImageMean(const Image *image,double *mean, double *standard_deviation,ExceptionInfo *exception)
A description of each parameter follows:
image
the image.
mean
the average value in the channel.
standard_deviation
the standard deviation of the channel.
exception
return any errors or warnings in this structure.
GetImageKurtosis
GetImageKurtosis() returns the kurtosis and skewness of one or more image channels.
The format of the GetImageKurtosis method is:
MagickBooleanType GetImageKurtosis(const Image *image,double *kurtosis, double *skewness,ExceptionInfo *exception)
A description of each parameter follows:
image
the image.
kurtosis
the kurtosis of the channel.
skewness
the skewness of the channel.
exception
return any errors or warnings in this structure.
GetImageRange
GetImageRange() returns the range of one or more image channels.
The format of the GetImageRange method is:
MagickBooleanType GetImageRange(const Image *image,double *minima, double *maxima,ExceptionInfo *exception)
A description of each parameter follows:
image
the image.
minima
the minimum value in the channel.
maxima
the maximum value in the channel.
exception
return any errors or warnings in this structure.
GetImageStatistics
GetImageStatistics() 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:
channel_statistics=GetImageStatistics(image,exception); red_mean=channel_statistics[RedChannel].mean;
Use MagickRelinquishMemory() to free the statistics buffer.
The format of the GetImageStatistics method is:
ChannelStatistics *GetImageStatistics(const Image *image, ExceptionInfo *exception)
A description of each parameter follows:
image
the image.
exception
return any errors or warnings in this structure.