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" . $p->getColorCount() . "\n" );
}
?>
This will print out something like:
252 250 252 1 : 125
194 156 182 1 : 126
109 18 79 1 : 11440
2 117 162 1 : 12761
255 255 255 1 : 40769
...where the colums are red, green, blue, alpha, followed by the number of times that colour appears in the image.
PHP.mk документација
Imagick::getImageHistogram
Почист и полокален преглед на PHP референцата, со задржана структура од PHP.net и подобра читливост за примери, секции и белешки.
Патека
imagick.getimagehistogram.php
Локална патека за оваа страница.
Извор
php.net/manual/en
Оригиналниот HTML се реупотребува и локално се стилизира.
Режим
Прокси + превод во позадина
Кодовите, табелите и белешките остануваат читливи во истиот тек.
Референца
imagick.getimagehistogram.php
Imagick::getImageHistogram
Референца за `imagick.getimagehistogram.php` со подобрена типографија и навигација.
Imagick::getImageHistogram
(PECL imagick 2, PECL imagick 3)
Imagick::getImageHistogram — Ја добива хистограмот на сликата
= NULL
Returns the image histogram as an array of ImagickPixel objects.
Параметри
Оваа функција нема параметри.
Вратени вредности
Returns the image histogram as an array of ImagickPixel objects.
Errors/Exceptions
Фрла ImagickException при грешка.
Примери
Example #1 Generates Imagick::getImageHistogram()
<?php
function getColorStatistics($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
//This might lead to bad results for images that are pathologically 'pixelly'
$imagick->adaptiveResizeImage(200, 200, true);
$histogramElements = $imagick->getImageHistogram();
$histogram = new \Imagick();
$histogram->newpseudoimage($histogramWidth, $histogramHeight * 3, 'xc:black');
$histogram->setImageFormat('png');
$getMax = function ($carry, $item) {
if ($item > $carry) {
return $item;
}
return $carry;
};
$colorValues = [
'red' => getColorStatistics($histogramElements, \Imagick::COLOR_RED),
'lime' => getColorStatistics($histogramElements, \Imagick::COLOR_GREEN),
'blue' => getColorStatistics($histogramElements, \Imagick::COLOR_BLUE),
];
$max = array_reduce($colorValues['red'] , $getMax, 0);
$max = array_reduce($colorValues['lime'] , $getMax, $max);
$max = array_reduce($colorValues['blue'] , $getMax, $max);
$scale = $histogramHeight / $max;
$count = 0;
foreach ($colorValues as $color => $values) {
$draw->setstrokecolor($color);
$offset = ($count + 1) * $histogramHeight;
foreach ($values as $index => $value) {
$draw->line($index, $offset, $index, $offset - ($value * $scale));
}
$count++;
}
$histogram->drawImage($draw);
header( "Content-Type: image/png" );
echo $histogram;
}
?>Белешки од корисници 1 белешка
Iddles ¶
пред 14 години