PHP 7.2.7 Released

Imagick::autoLevelImage

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Imagick::autoLevelImageDescription

说明

public bool Imagick::autoLevelImage ([ int $channel = Imagick::CHANNEL_DEFAULT ] )

Adjusts the levels of a particular image channel by scaling the minimum and maximum values to the full quantum range.

参数

channel

Which channel should the auto-levelling should be done on.

返回值

成功时返回 TRUE

范例

Example #1 Imagick::autoLevelImage()

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

?>

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