(PECL imagick 2, PECL imagick 3)
Imagick::setBackgroundColor — Sets the object's default background color
public Imagick::setBackgroundColor ( mixed $background ) : bool
Sets the object's default background color.
background
 Returns true on success. 
| Version | Description | 
|---|---|
| PECL imagick 2.1.0 | Now allows a string representing the color as a parameter. Previous versions allow only an ImagickPixel object. | 
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    https://www.php.net/manual/en/imagick.setbackgroundcolor.php