(PECL imagick 3 >= 3.3.0)
Imagick::brightnessContrastImage — Change the brightness and/or contrast of an image
$brightness, float $contrast, int $channel = Imagick::CHANNEL_DEFAULT): boolChange the brightness and/or contrast of an image. It converts the brightness and contrast parameters into slope and intercept and calls a polynomical function to apply to the image.
brightness
contrast
channel
成功时返回 true。
示例 #1 Imagick::brightnessContrastImage()
<?php
function brightnessContrastImage($imagePath, $brightness, $contrast, $channel) {
$imagick = new \Imagick(realpath($imagePath));
$imagick->brightnessContrastImage($brightness, $contrast, $channel);
header("Content-Type: image/jpg");
echo $imagick->getImageBlob();
}
?>