image - losing quality after adding watermark to the picture -


i'm working on website wich haven't create/developed

anyway users can upload image , when , there's function create duplicate of image watermark

but copy watermark has low quality , it's size smaller original image

i dont see lowering quality , maybe it's how ci watermark works ?!

without watermark

http://img.akstube.ir/images/2013/05/dsc_0168_69_70_tonemapped.jpg

with watermark 

http://img.akstube.ir/images/2013/05/irwm_dsc_0168_69_70_tonemapped.jpg

here function 

function ir_watermark($file,$name='',$rebuild=false) {    $ci = &get_instance();     $pathinfo = pathinfo($file);   $filename = $pathinfo['basename'];   $path = $pathinfo['dirname'];   $new_image = $path . '/irwm_'. $filename;   $path_to_img = base_url(str_replace(base_path(),'',$new_image));     if ($rebuild == false)   if (file_exists($new_image))   {     if ($ci->uri->segment(1) == 'test')   echo "<img src='{$path_to_img}' />";    return $path_to_img;   }     $config['source_image']   = $file;   $config['new_image']  = $new_image;   $config['wm_type'] = 'overlay';   $config['wm_overlay_path'] = base_path('/files/transparent_bar.png');   $config['wm_font_path'] = base_path('application/assets/view/tahomabd.ttf');   $config['wm_font_size']   = '8';   $config['wm_font_color'] = 'ffffff';   $config['wm_vrt_alignment'] = 'bottom';   $config['wm_hor_alignment'] = 'left';   $config['wm_hor_offset'] = '0';   $config['wm_vrt_offset'] = '0';    $ci->image_lib->initialize($config);    $ci->image_lib->watermark();     $config['new_image'] = $config['new_image'];   $config['source_image']   = $config['new_image'];    $config['wm_hor_offset'] = '10';   $config['wm_vrt_offset'] = '2';    $config['wm_overlay_path'] = base_path('/files/akstube_logo6.png');   $ci->image_lib->initialize($config);    $ci->image_lib->watermark();      $config['wm_type'] = 'text';   $config['wm_vrt_offset'] = '-3';    $config['wm_text'] = 'photo : ' . $name;   $config['wm_text'] = strtoupper($config['wm_text']);    $config['wm_hor_alignment'] = 'right';   $config['wm_hor_offset'] = '-50%';    $ci->image_lib->initialize($config);    $ci->image_lib->watermark();      if ($ci->uri->segment(1) == 'test')   echo "<img src='{$path_to_img}' />";    return $path_to_img; }

watermark image

http://akstube.ir/files/akstube_logo6.png http://akstube.ir//files/transparent_bar.png


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