Úprava obrázku

$filename = "fotky/neco.jpg";

// Set a maximum height and width
$width = 640;
$height = 480;

// Content type
  if($yuo[1] == 'jpg' OR $yuo[1] == 'jpeg' OR $yuo[1] == 'JPG' OR $yuo[1] == 'JPEG'){
  $action='imagecreatefromjpeg';
  }
    if($yuo[1] == 'png'){
  $action='imagecreatefrompng';
  }
     if($yuo[1] == 'gif'){
  $action='imagecreatefromgif';
  }
// Get new dimensions
list($width_orig, $height_orig) = getimagesize($filename);
if(($width_orig > $width) OR ($height_orig > $height)):
if ($width && ($width_orig < $height_orig)) {
   $width = ($height / $height_orig) * $width_orig;
} else {
   $height = ($width / $width_orig) * $height_orig;
}
else:
$width = $width_orig;
$height = $height_orig;
endif;

// Resample
$image_p = imagecreatetruecolor($width, $height);
$image = $action($filename);
$imagenew=imagecopyresampled($image_p, $image, 0, 0, 0, 0, $width, $height, $width_orig, $height_orig);

// Output
 if($yuo[1] == 'jpg' OR $yuo[1] == 'jpeg' OR $yuo[1] == 'JPG' OR $yuo[1] == 'JPEG'){
  $output='imagejpeg';
  }
    if($yuo[1] == 'png' OR $yuo[1] == 'PNG'){
  $output='imagepng';
  }
     if($yuo[1] == 'gif' OR $yuo[1] == 'GIF'){
  $output='imagegif';
  }
$imagenew =$output($image_p, null, 100);