(PECL imagick 3 >= 3.3.0)
Imagick::brightnessContrastImage — 變更影像的亮度及/或對比度
$brightness, float $contrast, int $channel = Imagick::CHANNEL_DEFAULT): bool變更影像的亮度及/或對比度。它會將亮度與對比度參數轉換為斜率與截距，並呼叫多項式函式套用至影像。
brightness
contrast
channel
成功時傳回 true。
範例 1 Imagick::brightnessContrastImage()
<?php
function brightnessContrastImage($imagePath, $brightness, $contrast, $channel) {
$imagick = new \Imagick(realpath($imagePath));
$imagick->brightnessContrastImage($brightness, $contrast, $channel);
header("Content-Type: image/jpg");
echo $imagick->getImageBlob();
}
?>