(PECL gmagick >= Unknown)
Gmagick::normalizeimage — Enhances the contrast of a color image
public Gmagick::normalizeimage ([ int $channel ] ) : Gmagick
Enhances the contrast of a color image by adjusting the pixels color to span the entire range of colors available.
channel
Identify which channel to normalize
The Gmagick object on success
Throws an GmagickException on error.
© 1997–2020 The PHP Documentation Group
Licensed under the Creative Commons Attribution License v3.0 or later.
https://www.php.net/manual/en/gmagick.normalizeimage.php