GD и борьба с прозрачностью

function setTransparency() {
        $dst = ImageCreateTrueColor($this->width, $this->height);
        $black = imagecolorallocate($dst, 0, 0, 0);
        imagecolortransparent($dst, $black);
        imagealphablending($dst, false); // one
        imageSaveAlpha($dst, true); // two
        imagecopyresampled($dst, $this->image, 0, 0, 0, 0, $this->width, $this->height, $this->width, $this->height);
        
        return $this;
    }

imagesavealpha($this->image, true);
        $angle = imagecreate(50, 50);
        $trans = imagecolorallocatealpha($angle, 0, 0, 0, 127);
        $color = imagecolorallocate($angle, 222, 222, 222);
        imagefill($angle, 0, 0, $trans);
        imagecolortransparent($angle, $trans);
        imagefilledarc($angle, 0, 0, 100, 100, 0, 90, $color, IMG_ARC_PIE);
        imagecolortransparent($angle, $color);