The getImageChannelKurtosis function accepts as a parameter any of the ImageMagick channel constants and returns an array containing elements with the two element values of 'kurtosis' and 'skewness.'For the inputted color values, you have the ImageMagick channel constant values that look like imagick::CHANNEL_UNDEFINED, with "_VALUE" values of: undefined, red, gray, cyan, green, magenta, blue, yellow, alpha, opacity, matte, black, index, all, and default. This is for measuring the particular channel for these colors of their own associated colorspaces.According to Wikipedia, the Kurtosis is "any measure of the 'peakedness' of the probability distribution of a real-valued random variable" and Skewness (its opposite) is "a measure of the asymmetry of the probability distribution of a real-valued random variable." The more colors vary from the inputted channel constant, you'll be more likely to get a skewness close to zero, and you'll get the opposite behavior from checking the kurtosis value, which makes sense, since skewness and kurtosis are considered mathematical antonyms.Some sample code :<?php $imagick_type = new Imagick(); $file_to_grab = "image_workshop_directory/test.bmp"; $file_handle_for_viewing_image_file = fopen($file_to_grab, 'a+'); $imagick_type->readImageFile($file_handle_for_viewing_image_file); $imagick_type_channel_kurtosis_red = $imagick_type->getImageChannelKurtosis(imagick::CHANNEL_RED); print("<pre>"); print_r($imagick_type_channel_kurtosis_red); print("</pre>");?>The results for performing this function upon a photo of the ocean...ImageMagick - Channel Kurtosis Channel - Undefined :Kurtosis : 0Skewness : 0 Channel - Red :Kurtosis : 0.920611158888Skewness : 1.52701528976 Channel - Gray :Kurtosis : 0.920611158888Skewness : 1.52701528976 Channel - Cyan :Kurtosis : 0.920611158888Skewness : 1.52701528976 Channel - Green :Kurtosis : -0.286520845928Skewness : 1.05203603783 Channel - Magenta :Kurtosis : -0.286520845928Skewness : 1.05203603783 Channel - Blue :Kurtosis : -0.849997917796Skewness : 0.807852655795 Channel - Yellow :Kurtosis : -0.849997917796Skewness : 0.807852655795 Channel - Alpha :Kurtosis : 0Skewness : 0 Channel - Opacity :Kurtosis : 0Skewness : 0 Channel - Matte :Kurtosis : 0Skewness : 0 Channel - Black :Kurtosis : 0Skewness : 0 Channel - Index :Kurtosis : 0Skewness : 0 Channel - All :Kurtosis : 0.509521246195Skewness : 1.33491479552 Channel - Default :Kurtosis : -0.349955122843Skewness : 1.00561407035