Imagick::randomThresholdImage

(PECL imagick 2.0.0)

Imagick::randomThresholdImageCreates a high-contrast, two-color image

说明

bool Imagick::randomThresholdImage ( float $low , float $high [, int $channel = Imagick::CHANNEL_ALL ] )

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();
}

?>

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