Imagick
PHP マニュアル

Imagick::autoLevelImage

Adjusts the levels of a particular image channel

説明

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.

パラメータ

channel

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

戻り値

成功した場合に true を返します。

例

例1 Imagick::autoLevelImage

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

?>