(PECL gmagick >= Unknown)
Gmagick::newimage — Creates a new image
$width
   , int $height
   , string $background
   [, string $format    
  ] )Creates a new image with the specified background color
width
     Width of the new image
height
     Height of the new image
background
     The background color used for this image (as float)
format
     Image format.
The Gmagick object on success
Throws an GmagickException on error.