(PECL imagick 2, PECL imagick 3)
Imagick::randomThresholdImage — Creates a high-contrast, two-color image
$low, float $high, int $channel = Imagick::CHANNEL_DEFAULT): boolChanges the value of individual pixels based on the intensity of each pixel compared to threshold. The result is a high-contrast, two color image. 此方法在Imagick基于ImageMagick 6.2.9以上版本編譯時(shí)可用。
lowThe low point
highThe high point
channelProvide any channel constant that is valid for your channel mode. To apply to more than one channel, combine channeltype constants using bitwise operators. Refer to this list of channel constants.
成功時(shí)返回 true。
示例 #1 Imagick::randomThresholdImage()
<?php
function randomThresholdimage($imagePath, $lowThreshold, $highThreshold, $channel) {
$imagick = new \Imagick(realpath($imagePath));
$imagick->randomThresholdimage(
$lowThreshold * \Imagick::getQuantum(),
$highThreshold * \Imagick::getQuantum(),
$channel
);
header("Content-Type: image/jpg");
echo $imagick->getImageBlob();
}
?>