Generovanie zmenseniny obrazku

ImageCreateFromGif
ImageCreateFromJpeg
ImageCreateFromPng

ImageSX
ImageSY

imagecreatetruecolor

imagecolorallocate

imagefill

ImageCopyResized

imagejpeg
imagegif
imagepng

imagedestroy

$KamUlozit = "obrazky/$subor; //cesta, kam zmenseny subor ulozit
   $NovaSirka = 65; //maximalna sirka zmenseneho obrazku
   $NovaVyska = 60;  //maximalna vyska zmenseneho obrazku
{ //zistime povodnu velkost obrazku
list($sirka, $vyska) = getimagesize($subor);

$image_p = imagecreatetruecolor($NovaSirka, $NovaVyska);
//otvorenie povodneho obrazku zo suboru
$image = imagecreatefromjpeg($subor);
//okopirujeme zmenseny obrazok do povodneho

imagecopyresampled($image_p, $image, 0, 0, 0, 0, $NovaSirka, $NovaVyska, $sirka, $vyska);

//a ulozime
imagejpeg($image_p, $KamUlozit, 70); //to cislo 70 urcuje kvalitu, v akej sa ma obrazok ulozit
}

<img src="<?echo $KamUlozit;?>"

// --------- ULOZIME ARCHIV
if ($_FILES['f_zip']['name'] == '') {
   exit();
}

 
  $file = my_jpg_image_name($_FILES['f_zip']['name']);
  $ciel="../pic_temp/".$file;
   
  move_uploaded_file($_FILES['f_zip']['tmp_name'], $ciel) or die ("Smrt kapitalizmu! (subor sa nepodarilo ulozit na server)");
  // vytvor zmenseninu
  // Get new dimensions
  list($width, $height) = getimagesize($ciel);
 
  // velke foto
  if ($width > FOTO_GAL_X) {
    $new_width = FOTO_GAL_X;
    $new_height = ceil(FOTO_GAL_X * $height / $width);
    // Resample
    $image_p = imagecreatetruecolor($new_width, $new_height);
    $image = imagecreatefromjpeg($ciel);
    imagecopyresampled($image_p, $image, 0, 0, 0, 0, $new_width, $new_height, $width, $height);
    $new_nahlad = "../pic_fotky/".$file;
    // Output
    imagejpeg($image_p, $new_nahlad, PART_QUAL);
  }
  // nahlad 
  $x_const = FOTO_THUMB_X;
  $y_const = FOTO_THUMB_Y;
  if($width > $x_const || $height > $y_const){ // ak je aspon jeden rozmer vascsi, ideme menit obr.
    // nastav spravne nove rozmery
    if ($width > $x_const && $height > $y_const) {
       if ($height > $width){
         $new_width = $y_const * $width / $height;
         $new_height = $y_const;
      } else { // na sirku
         $new_width = $x_const;
         $new_height = $x_const * $height / $width;
      }
    } elseif ($width > $x_const && $height <= $y_const) {
      $new_width = $x_const;
      $new_height = $x_const * $height / $width;
    } elseif ($width <= $x_const && $height > $y_const) {
      $new_width = $y_const * $width / $height;
      $new_height = $y_const;
    }
    // nove rozmery nastavene
    // Resample
    $image_p = imagecreatetruecolor($new_width, $new_height);
    $image = imagecreatefromjpeg($ciel);
    imagecopyresampled($image_p, $image, 0, 0, 0, 0, $new_width, $new_height, $width, $height);
    $new_nahlad = "../pic_nahlady/".$file;
    // Output
    imagejpeg($image_p, $new_nahlad, PART_QUAL);
  } else {
    copy($ciel, "../pic_nahlady/".$file);
  }
  unlink($ciel);
  // uloz do databazy
  $result = mysql_query("BLA BLA nejaky SQL prikaz");
  if ($result) {
    echo "Nech zije socialisticky tabor (fotka uspesne ulozena)!";
    exit();
  }