src/Sparkline/Picture.php
protected function getBackground(array $setColor = [])
    {
        if ($setColor) {
            return imagecolorallocate(
                $this->resource,
                $setColor[0],
                $setColor[1],
                $setColor[2]
            );
        }

        return imagecolorallocatealpha(
            $this->resource,
            0,
            0,
            0,
            127
        );
    }
protected function getBackground(array $setColor = [])
    {
        if ($setColor) {
            return imagecolorallocate(
                $this->resource,
                $setColor[0],
                $setColor[1],
                $setColor[2]
            );
        }

        return imagecolorallocatealpha(
            $this->resource,
            0,
            0,
            0,
            127
        );
    }
@param array $setColor

@return int