Imagick::autoLevelImage

(PECL imagick 3 >= 3.3.0)

Imagick::autoLevelImage — Description

说明

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

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

示例 #1 Imagick::autoLevelImage()

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

?>