array ( 0 => 'index.php', 1 => 'PHP Manual', ), 'head' => array ( 0 => 'UTF-8', 1 => 'zh', ), 'this' => array ( 0 => 'imagick.thresholdimage.php', 1 => 'Imagick::thresholdImage', 2 => 'Changes the value of individual pixels based on a threshold', ), 'up' => array ( 0 => 'class.imagick.php', 1 => 'Imagick', ), 'prev' => array ( 0 => 'imagick.textureimage.php', 1 => 'Imagick::textureImage', ), 'next' => array ( 0 => 'imagick.thumbnailimage.php', 1 => 'Imagick::thumbnailImage', ), 'alternatives' => array ( ), 'source' => array ( 'lang' => 'en', 'path' => 'reference/imagick/imagick/thresholdimage.xml', ), 'history' => array ( ), ); $setup["toc"] = $TOC; $setup["toc_deprecated"] = $TOC_DEPRECATED; $setup["parents"] = $PARENTS; manual_setup($setup); contributors($setup); ?>

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

示例

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();
}

?>