Imagick::getImageHistogram

(PECL imagick 2.0.0)

Imagick::getImageHistogram — Gets the image histogram

Описание

array Imagick::getImageHistogram ( void )

Returns the image histogram as an array of ImagickPixel objects.

Возвращаемые значения

Returns the image histogram as an array of ImagickPixel objects.

Ошибки

Вызывает ImagickException при ошибке.

Коментарии

Jun 20

Автор: Iddles


Scratched my head for a while trying to figure out why this only returned a list of coloured pixels, and seemingly no colour count. Well it turns out that for some reason, the ImagickPixel class has a "getColorCount" method, which seems a strange place for it but hey.



<?php

$image = new Imagick("thing.png");

$pixels=$image->getImageHistogram();

foreach($pixels as $p){

 $colors = $p->getColor();

 foreach($colors as $c){

        print( "$c\t" );

 }

 print( "\t:\t" . $p->getColorCount() . "\n" );

}

?>



This will print out something like:



252    250    252    1    :    125

194    156    182    1    :    126

109    18    79    1    :    11440

2    117    162    1    :    12761

255    255    255    1    :    40769



...where the colums are red, green, blue, alpha, followed by the number of times that colour appears in the image.