Resize images with PHP, support PNG, JPG

Question

I am using this class:

class ImgResizer {  function ImgResizer($originalFile = '$newName') {     $this -> originalFile = $originalFile; } function resize($newWidth, $targetFile) {     if (empty($newWidth) || empty($targetFile)) {         return false;     }     $src = imagecreatefromjpeg($this -> originalFile);     list($width, $height) = getimagesize($this -> originalFile);     $newHeight = ($height / $width) * $newWidth;     $tmp = imagecreatetruecolor($newWidth, $newHeight);     imagecopyresampled($tmp, $src, 0, 0, 0, 0, $newWidth, $newHeight, $width, $height);      if (file_exists($targetFile)) {         unlink($targetFile);     }     imagejpeg($tmp, $targetFile, 95); }  } 

Which works excellently, but it fails with png's, it creates a resized black image.

Is there a way to tweak this class to support png images?

Answer 1

function resize($newWidth, $targetFile, $originalFile) {      $info = getimagesize($originalFile);     $mime = $info['mime'];      switch ($mime) {             case 'image/jpeg':                     $image_create_func = 'imagecreatefromjpeg';                     $image_save_func = 'imagejpeg';                     $new_image_ext = 'jpg';                     break;              case 'image/png':                     $image_create_func = 'imagecreatefrompng';                     $image_save_func = 'imagepng';                     $new_image_ext = 'png';                     break;              case 'image/gif':                     $image_create_func = 'imagecreatefromgif';                     $image_save_func = 'imagegif';                     $new_image_ext = 'gif';                     break;              default:                      throw new Exception('Unknown image type.');     }      $img = $image_create_func($originalFile);     list($width, $height) = getimagesize($originalFile);      $newHeight = ($height / $width) * $newWidth;     $tmp = imagecreatetruecolor($newWidth, $newHeight);     imagecopyresampled($tmp, $img, 0, 0, 0, 0, $newWidth, $newHeight, $width, $height);      if (file_exists($targetFile)) {             unlink($targetFile);     }     $image_save_func($tmp, "$targetFile.$new_image_ext"); } 

Answer 2

I've written a class that will do just that and is nice and easy to use. It's called
PHP Image Magician

$magicianObj = new imageLib('racecar.jpg'); $magicianObj -> resizeImage(100, 200); $magicianObj -> saveImage('racecar_convertd.png', 100); 

It supports Read and Write (including converting) the following formats

• jpg
• png
• gif
• bmp

And can read only

• psd's

Example

// Include PHP Image Magician library require_once('php_image_magician.php');  // Open JPG image $magicianObj = new imageLib('racecar.jpg');  // Resize to best fit then crop $magicianObj -> resizeImage(100, 200, 'crop');  // Save resized image as a PNG $magicianObj -> saveImage('racecar_small.png');