Imagick::getImageHistogram

(PECL imagick 2.0.0)

Imagick::getImageHistogram — Gets the image histogram

Description

array Imagick::getImageHistogram ( void )

Returns the image histogram as an array of ImagickPixel objects.

Return Values

Returns the image histogram as an array of ImagickPixel objects.

Errors/Exceptions

Throws ImagickException on error.

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.