Sépia aspect ancien

                               

                            
/*---------------------------------------------------------------*/
/*
    Titre : Sépia aspect ancien                                                                                          
                                                                                                                          
    URL   : https://phpsources.net/code_s.php?id=984
    Date édition     : 15 Fev 2019                                                                                       
*/
/*---------------------------------------------------------------*/

 function sepia_convert($src , $dest , $format){
 /* Paramètres : $src : fichier source 
  * $dest : fichier de destination 
  * $format : format de l'image résultat 
  * ("GIF", "JPG", "PNG", "WBMP") 
  */ 
  if (file_exists($src)) 
  $size = getimagesize($src); 
  else 
  return FALSE; 
  
  switch($size[2]) 
  { 
  case 1 : 
  if (imagetypes() & IMG_GIF) 
  $pic = imagecreatefromgif($src); 
  break; 
  case 2 : 
  if (imagetypes() & IMG_JPG) 
  $pic = imagecreatefromjpeg($src); 
  break; 
  case 3 : 
  if (imagetypes() & IMG_PNG) 
  $pic = imagecreatefrompng($src); 
  break; 
  default : 
  if (preg_match("/\.wbmp$/i", $src) && (imagetypes() & IMG_WBMP)) 
  $pic = imagecreatefromwbmp($src); 
  } 
  if (!$pic) 
  return FALSE; 
  
  $colors_num = imagecolorstotal($pic); 
  
  for($i=0;$i<$colors_num;$i++) 
  { 
  $color = imagecolorsforindex($pic, $i); 
  $r = $color["red"]; 
  $g = $color["green"]; 
  $b = $color["blue"]; 
  
  $s = ($r+$g+$b)/3; 
  
  $contrast = 20; 
  $r = ($s*(100-$contrast)/100) + ($r*$contrast/100); 
  $g = ($s*(100-$contrast)/100) + ($g*$contrast/100); 
  $b = ($s*(100-$contrast)/100) + ($b*$contrast/100); 
  
  $r = $r + ($r*49/100); 
  $g = $g + ($g*45/100); 
  
  if ($r > 255) 
  $r = 255; 
  if ($g > 255) 
  $g = 255; 
   if ($b > 255) 
  $b = 255; 
  
  imagecolorset($pic, $i, $r, $g, $b); 
  } 
  
  $format = strtoupper($format); 
  if ($format == "GIF") 
  { 
  if (imagetypes() & IMG_GIF) 
  imagegif($pic, $dest); 
  else 
  return FALSE; 
  } 
  else if ($format == "JPG") 
  { 
  if (imagetypes() & IMG_JPG) 
  imagejpeg($pic, $dest); 
  else 
  return FALSE; 
  } 
  else if ($format == "PNG") 
  { 
  if (imagetypes() & IMG_PNG) 
  imagepng($pic, $dest); 
  else 
  return FALSE; 
  } 
  else if ($format == "WBMP") 
  { 
  if (imagetypes() & IMG_WBMP) 
  imagewbmp($pic, $dest); 
  else 
  return FALSE; 
  } 
  else return FALSE; 
  return TRUE; 
}

?>