Enhances the contrast of a color image by adjusting the pixels color to span the entire range of colors available.
Original on left side, normalised on right.
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Image
Channel
Enhances the contrast of a color image by adjusting the pixels color to span the entire range of colors available.
Parameters
channelintProvide 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.
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();
}