Imagick::randomThresholdImage()

(PECL imagick 2.0.0)

Creates a high-contrast, two-color image

说明

Imagick::randomThresholdImage(float $low,float $high[,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.此方法在Imagick基于ImageMagick 6.2.9以上版本编译时可用。

参数

$low

The low point

$high

The high point

$channel

Provide 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.

返回值

成功时返回TRUE。

范例

Example #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();
}
?>