Imagick::getImageChannelKurtosis

    (PECL imagick 2 >= 2.3.0, PECL imagick 3)

    Imagick::getImageChannelKurtosis — Obtiene la curtosis y la asimetría estadística de un canal específico

    Descripción

    public Imagick::getImageChannelKurtosis(int $channel = Imagick::CHANNEL_DEFAULT): array

    Obtiene la curtosis y la asimetría estadística de un canal específico. Este método está disponible si Imagick ha sido compilado con la versión 6.4.9 o superior de ImageMagick.

    Parámetros

    channel

    Proporciona cualquier contante de canal que sea válida para su modo de canal. Para aplicarlo a más de un canal, combine constantes de canal using bitwise operadores bit a bit. El valor por defecto para Imagick::CHANNEL_DEFAULT. Referirse a esta lista de constantes de canal

    Valores devueltos

    Devuelve una matriz con los miembros kurtosis (curtosis) y skewness (asimetría estadística).

    Errores/Excepciones

    Lanza ImagickException en caso de error.

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    User Contributed Notes 1 note

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    holdoffhunger at gmail dot com
    12 years ago
    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

    // Author: holdoffhunger@gmail.com

    // Imagick Type
    // ---------------------------------------------

    $imagick_type = new Imagick();

    // Open File
    // ---------------------------------------------

    $file_to_grab = "image_workshop_directory/test.bmp";

    $file_handle_for_viewing_image_file = fopen($file_to_grab, 'a+');

    // Grab File
    // ---------------------------------------------

    $imagick_type->readImageFile($file_handle_for_viewing_image_file);

    // Get Quantum Range
    // ---------------------------------------------

    $imagick_type_channel_kurtosis_red = $imagick_type->getImageChannelKurtosis(imagick::CHANNEL_RED);

    // Print Results
    // ---------------------------------------------

    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 : 0
    Skewness : 0

    Channel - Red :

    Kurtosis : 0.920611158888
    Skewness : 1.52701528976

    Channel - Gray :

    Kurtosis : 0.920611158888
    Skewness : 1.52701528976

    Channel - Cyan :

    Kurtosis : 0.920611158888
    Skewness : 1.52701528976

    Channel - Green :

    Kurtosis : -0.286520845928
    Skewness : 1.05203603783

    Channel - Magenta :

    Kurtosis : -0.286520845928
    Skewness : 1.05203603783

    Channel - Blue :

    Kurtosis : -0.849997917796
    Skewness : 0.807852655795

    Channel - Yellow :

    Kurtosis : -0.849997917796
    Skewness : 0.807852655795

    Channel - Alpha :

    Kurtosis : 0
    Skewness : 0

    Channel - Opacity :

    Kurtosis : 0
    Skewness : 0

    Channel - Matte :

    Kurtosis : 0
    Skewness : 0

    Channel - Black :

    Kurtosis : 0
    Skewness : 0

    Channel - Index :

    Kurtosis : 0
    Skewness : 0

    Channel - All :

    Kurtosis : 0.509521246195
    Skewness : 1.33491479552

    Channel - Default :

    Kurtosis : -0.349955122843
    Skewness : 1.00561407035
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