Adapter/GD.php
protected function doResize($bg, $target_width, $target_height, $new_width, $new_height)
    {
        $width = $this->width();
        $height = $this->height();
        $n = imagecreatetruecolor($target_width, $target_height);

        if ($bg != 'transparent') {
            imagefill($n, 0, 0, ImageColor::gdAllocate($this->resource, $bg));
        } else {
            imagealphablending($n, false);
            $color = ImageColor::gdAllocate($this->resource, 'transparent');

            imagefill($n, 0, 0, $color);
            imagesavealpha($n, true);
        }

        imagecopyresampled($n, $this->resource, ($target_width - $new_width) / 2, ($target_height - $new_height) / 2, 0, 0, $new_width, $new_height, $width, $height);
        imagedestroy($this->resource);

        $this->resource = $n;

        return $this;
    }
protected function doResize($bg, $target_width, $target_height, $new_width, $new_height)
    {
        $width = $this->width();
        $height = $this->height();
        $n = imagecreatetruecolor($target_width, $target_height);

        if ($bg != 'transparent') {
            imagefill($n, 0, 0, ImageColor::gdAllocate($this->resource, $bg));
        } else {
            imagealphablending($n, false);
            $color = ImageColor::gdAllocate($this->resource, 'transparent');

            imagefill($n, 0, 0, $color);
            imagesavealpha($n, true);
        }

        imagecopyresampled($n, $this->resource, ($target_width - $new_width) / 2, ($target_height - $new_height) / 2, 0, 0, $new_width, $new_height, $width, $height);
        imagedestroy($this->resource);

        $this->resource = $n;

        return $this;
    }
protected function doResize ( $ bg , $ target_width , $ target_height , $ new_width , $ new_height ) { $ width = $ this -> width ( ) ; $ height = $ this -> height ( ) ; $ n = imagecreatetruecolor ( $ target_width , $ target_height ) ; if ( $ bg != 'transparent' ) { imagefill ( $ n , 0 , 0 , ImageColor :: gdAllocate ( $ this -> resource , $ bg ) ) ; } else { imagealphablending ( $ n , false ) ; $ color = ImageColor :: gdAllocate ( $ this -> resource , 'transparent' ) ; imagefill ( $ n , 0 , 0 , $ color ) ; imagesavealpha ( $ n , true ) ; } imagecopyresampled ( $ n , $ this -> resource , ( $ target_width - $ new_width ) / 2 , ( $ target_height - $ new_height ) / 2 , 0 , 0 , $ new_width , $ new_height , $ width , $ height ) ; imagedestroy ( $ this -> resource ) ; $ this -> resource = $ n ; return $ this ; }
Do the image resize.

@return $this
Do the image resize .