Imagick
PHP Manual

Imagick::whiteThresholdImage

(PECL imagick 2.0.0)

Imagick::whiteThresholdImageForce all pixels above the threshold into white

说明

bool Imagick::whiteThresholdImage ( mixed $threshold )

Is like Imagick::ThresholdImage() but force all pixels above the threshold into white while leaving all pixels below the threshold unchanged.

参数

threshold

返回值

成功时返回 TRUE

更新日志

版本 说明
2.1.0 Now allows a string representing the color as a parameter. Previous versions allow only an ImagickPixel object.

范例

Example #1 Imagick::whiteThresholdImage()

<?php
function whiteThresholdImage($imagePath$color) {
    
$imagick = new \Imagick(realpath($imagePath));
    
$imagick->whiteThresholdImage($color);
    
header("Content-Type: image/jpg");
    echo 
$imagick->getImageBlob();
}

?>


Imagick
PHP Manual