(PECL imagick 2, PECL imagick 3)
Imagick::normalizeImage — Enhances the contrast of a color image
$channel = Imagick::CHANNEL_DEFAULT
) : boolEnhances the contrast of a color image by adjusting the pixels color to span the entire range of colors available.
channelProvide any channel constant that is valid for your channel mode. To apply to more than one channel, combine channeltype constants using bitwise operators. Refer to this list of channel constants.
成功时返回 true。
Example #1 Imagick::normalizeImage()
<?php
function normalizeImage($imagePath, $channel) {
$imagick = new \Imagick(realpath($imagePath));
$original = clone $imagick;
$original->cropimage($original->getImageWidth() / 2, $original->getImageHeight(), 0, 0);
$imagick->normalizeImage($channel);
$imagick->compositeimage($original, \Imagick::COMPOSITE_ATOP, 0, 0);
header("Content-Type: image/jpg");
echo $imagick->getImageBlob();
}
?>