Adjusts the levels of a particular image channel

# Imagick::autoLevelImage

(PECL imagick 3 >= 3.3.0)

Imagick::autoLevelImage — Adjusts the levels of a particular image channel

### Description

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.

### Parameters

`channel`

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

### Return Values

Returns `true` on success.

### Examples

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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