Imagick::brightnessContrastImage

(PECL imagick 3 >= 3.3.0)

Imagick::brightnessContrastImage — Description

说明

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.

参数

brightness

contrast

channel

返回值

成功时返回 true。

范例

示例 #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();
}

?>