Imagick::getImageHistogram

(PECL imagick 2.0.0)

Imagick::getImageHistogramObtiene el histograma de la imagen

DescripciĆ³n

array Imagick::getImageHistogram ( void )

Devuelve el histograma de la imagen como un array de objetos ImagickPixel.

Valores devueltos

Devuelve el histograma de la imagen como un array de objetos ImagickPixel.

Errores/Excepciones

Lanza ImagickException en caso de error.

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Iddles
2 years ago
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.
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