PHP 5.4.33 Released

Imagick::getImageHistogram

(PECL imagick 2.0.0)

Imagick::getImageHistogramGets 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.

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User Contributed Notes 1 note

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Iddles
3 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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