(PECL imagick 2, PECL imagick 3)
Imagick::contrastImage — Change the contrast of the image
Enhances the intensity differences between the lighter and darker elements of the image. Set sharpen to a value other than 0 to increase the image contrast otherwise the contrast is reduced.
sharpenThe sharpen value
成功时返回 true。
错误时抛出 ImagickException。
示例 #1 Imagick::contrastImage()
<?php
function contrastImage($imagePath, $contrastType) {
$imagick = new \Imagick(realpath($imagePath));
if ($contrastType != 2) {
$imagick->contrastImage($contrastType);
}
header("Content-Type: image/jpg");
echo $imagick->getImageBlob();
}
?>