Pop\Image\Gd::colorTotal PHP Метод

    public function colorTotal()
    {
        // Set the image resource and get the total number of colors.
        $this->createResource();
        $colors = imagecolorstotal($this->resource);
        // Destroy the image resource.
        $this->destroy();
        return $colors;
    }

 public function testColorTotal()
 {
     $i = new Gd(__DIR__ . '/../tmp/test.gif');
     $this->assertEquals(16, $i->colorTotal());
 }