(PHP 4 >= 4.0.6, PHP 5, PHP 7)
Create a new true color image
resource imagecreatetruecolor ( int $width, int $height )
imagecreatetruecolor() returns an image identifier representing a black image of the specified size.
Depending on your PHP and GD versions this function is defined or not. With PHP 4.0.6 through 4.1.x this function always exists if the GD module is loaded, but calling it without GD2 being installed PHP