Resizing Images

[loureiro]

Hi,

I am working on a function to resize both gif's and jpg's and i seem to be getting an error on the following line:

if (imagegif($DEST_IMAGE,$outputSource))

here is the entire code:

//PURPOSE: creates a resized image in the same directory that the images source is in
//FIELDS: $imageSource  - Location of image to be resized
//        $width        - Width of output picture
//        $height       - Height of output picture
//        $outputSource - Name to call file
//EXAMPLE CODE: Client Login V1.0 - status.php
//KEYWORD: images, resize, resize images, jpg, create
function createResizedImage($imageSource,$width,$height,$outputSource)
{
  //get the pictures properties
  $imageProperties1 = getimagesize($imageSource);

  $backupFile = "";
  if ($imageProperties1[2] == 1)
  {
    //create name for backup file
    $backupFile = $outputSource . "_backup.jpg";
  }
  else if ($imageProperties1[2] == 2)
  {
    //create name for backup file
    $backupFile = $outputSource . "_backup.gif";
  }

  //copy input file to location of backup file
  copy($imageSource,$backupFile);

  //get the pictures properties
  $imageProperties = getimagesize($backupFile);

  //gif code
  if ($imageProperties[2] == 1)
  {
    $srcImage = ImageCreateFromGIF($backupFile);
    $SRC_X = ImageSX($srcImage);
    $SRC_Y = ImageSY($srcImage);
    if (($height == "0") && ($width == "0"))
	{
      return(0);
    }
	else if($height == "0")
	{
      $SCALEX = $width/($SRC_X-1);
      $height = $SRC_Y*$SCALEX;
    }
	elseif ($width == "0")
	{
      $SCALEY = $height/($SRC_Y-1);
      $width = $SRC_X*$SCALEY;
    }
    $width = (int)($width);
    $height = (int)($height);
    $DEST_IMAGE = imagecreatetruecolor($width, $height);
    unlink($backupFile);
    if (!imagecopyresized($DEST_IMAGE, $srcImage, 0, 0, 0, 0, $width, $height, $SRC_X, $SRC_Y))
	{
      imagedestroy($srcImage);
      imagedestroy($DEST_IMAGE);
      return(0);
    }
	else
	{
      imagedestroy($srcImage);
      if (imagegif($DEST_IMAGE,$outputSource))
	  {
        imagedestroy($DEST_IMAGE);
        return(1);
      }
      imagedestroy($DEST_IMAGE);
    }
  }
  //jpeg code
  else if ($imageProperties[2] == 2)
  {
    $srcImage = ImageCreateFromJPEG($backupFile);
    $SRC_X = ImageSX($srcImage);
    $SRC_Y = ImageSY($srcImage);
    if (($height == "0") && ($width == "0"))
	{
      return(0);
    }
	else if($height == "0")
	{
      $SCALEX = $width/($SRC_X-1);
      $height = $SRC_Y*$SCALEX;
    }
	elseif ($width == "0")
	{
      $SCALEY = $height/($SRC_Y-1);
      $width = $SRC_X*$SCALEY;
    }
    $width = (int)($width);
    $height = (int)($height);
    $DEST_IMAGE = imagecreatetruecolor($width, $height);
    unlink($backupFile);
    if (!imagecopyresized($DEST_IMAGE, $srcImage, 0, 0, 0, 0, $width, $height, $SRC_X, $SRC_Y))
	{
      imagedestroy($srcImage);
      imagedestroy($DEST_IMAGE);
      return(0);
    }
	else
	{
      imagedestroy($srcImage);
      if (imagejpeg($DEST_IMAGE,$outputSource))
	  {
        imagedestroy($DEST_IMAGE);
        return(1);
      }
      imagedestroy($DEST_IMAGE);
    }
  }
  return(0);
}

can anyone tell me why its giving me the following error?

Call to undefined function: imagegif()

Im running: PHP 4.3.3

[loureiro]

nevermind! i just found out that the GD library doesnt include it because the people who patent things are retards and would allow someone to patent it! so im gonna have to live without for a few more months! how rediculous is that? why dont you go off and patent the way you do addition!

[dave420]

To be honest, GIF contains compression techniques copyrighted by compuserve or someone. That's valuable commercial property. We're not talking about a comma seperated values file, but a serious binary construct dating back years and years.

Credit where credit's due - it's a great format that has served the internet well.