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Imagick::normalizeImage

← newPseudoImage   oilPaintImage →
Enhances the contrast of a color image by adjusting the pixels color to span the entire range of colors available.
As the effect is very subtle, to make it easier to see the different, the original images is on the left side, normalised on right.

function normalizeImage($image_path, $channel)
{
    $imagick = new \Imagick(realpath($image_path));
    $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/jpeg");
    echo $imagick->getImageBlob();
}