Change the brightness and/or contrast of an image

# Imagick::brightnessContrastImage

(PECL imagick 3 >= 3.3.0)

Imagick::brightnessContrastImage — Change the brightness and/or contrast of an image

### Description

public Imagick::brightnessContrastImage(float `$brightness`, float `$contrast`, int `$channel` = Imagick::CHANNEL_DEFAULT): bool

Change the brightness and/or contrast of an image. It converts the brightness and contrast parameters into slope and intercept and calls a polynomical function to apply to the image.

### Parameters

`brightness`

`contrast`

`channel`

### Return Values

Returns `true` on success.

### Examples

Example #1 Imagick::brightnessContrastImage()

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