(PECL imagick 2, PECL imagick 3)
Imagick::getImageHistogram — Gets the image histogram
Returns the image histogram as an array of ImagickPixel objects.
此函数没有参数。
Returns the image histogram as an array of ImagickPixel objects.
错误时抛出 ImagickException。
示例 #1 Generates Imagick::getImageHistogram()
<?php
function getColorStatistics($histogramElements, $colorChannel) {
$colorStatistics = [];
foreach ($histogramElements as $histogramElement) {
$color = $histogramElement->getColorValue($colorChannel);
$color = intval($color * 255);
$count = $histogramElement->getColorCount();
if (array_key_exists($color, $colorStatistics)) {
$colorStatistics[$color] += $count;
}
else {
$colorStatistics[$color] = $count;
}
}
ksort($colorStatistics);
return $colorStatistics;
}
function getImageHistogram($imagePath) {
$backgroundColor = 'black';
$draw = new \ImagickDraw();
$draw->setStrokeWidth(0); //make the lines be as thin as possible
$imagick = new \Imagick();
$imagick->newImage(500, 500, $backgroundColor);
$imagick->setImageFormat("png");
$imagick->drawImage($draw);
$histogramWidth = 256;
$histogramHeight = 100; // the height for each RGB segment
$imagick = new \Imagick(realpath($imagePath));
//Resize the image to be small, otherwise PHP tends to run out of memory