(PECL gmagick >= Unknown)
Gmagick::setimagebackgroundcolor — Sets the image background color
public Gmagick::setimagebackgroundcolor ( GmagickPixel $color ) : Gmagick
Sets the image background color.
color
The background pixel wand.
The Gmagick object on success
Throws an GmagickException on error.
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https://www.php.net/manual/en/gmagick.setimagebackgroundcolor.php