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PHP - Manual: Imagick::thresholdImage

2024-04-28

Imagick::thresholdImage

(PECL imagick 2, PECL imagick 3)

Imagick::thresholdImageChanges the value of individual pixels based on a threshold

说明

public Imagick::thresholdImage(float $threshold, int $channel = Imagick::CHANNEL_DEFAULT): bool

Changes the value of individual pixels based on the intensity of each pixel compared to threshold. The result is a high-contrast, two color image.

参数

threshold

channel

返回值

成功时返回 true

范例

示例 #1 Imagick::thresholdImage()

<?php
function thresholdimage($imagePath$threshold$channel) {
    
$imagick = new \Imagick(realpath($imagePath));
    
$imagick->thresholdimage($threshold * \Imagick::getQuantum(), $channel);
    
header("Content-Type: image/jpg");
    echo 
$imagick->getImageBlob();
}

?>
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User Contributed Notes 1 note

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php t traction dot de
9 years ago
getQuantumRange() can be handy here:

<?php
$i
= new Imagick($imageFile);
$max = $i->getQuantumRange();
$max = $max["quantumRangeLong"];
$i->thresholdImage(0.77 * $max);
?>

官方地址:https://www.php.net/manual/en/imagick.thresholdimage.php

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