Imagick::getImageHistogram

(PECL imagick 2.0.0)

Imagick::getImageHistogram — Gets the image histogram

说明

array Imagick::getImageHistogram ( void )

Returns the image histogram as an array of ImagickPixel objects.

返回值

Returns the image histogram as an array of ImagickPixel objects.

错误/异常

错误时抛出 ImagickException .

PHP手册 - N: Gets the image histogram

用户评论:

Iddles (20-Jun-2011 12:02)

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.