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