[PHP] image resize problem


OSNN Veteran Addict
6 Mar 2002
$file = $_GET['file'];
list($height,$width,$type,$attr) = getimagesize($file);
$file_info = getimagesize($file);

$new_height = $_GET['max_height'];
$new_width = $_GET['max_width'];

//print $type;
$mime = $file_info['mime'];
//print $mime;
if ($height > $width){
  header("Content-type: $mime");
  $height_calc = $height - $new_height;
  $width_calc = $width - $new_width;
  if ($height_calc > $width_calc){
    $calc = $new_height / $height;
    $new_width = $width * $calc;
    $calc = $new_width / $width;
    $new_height = $height * $calc;
  if ($type == 3){
    //here is the problem
    $old_img = imagecreatefrompng($file);
    $new_img = imagecreatetruecolor($new_height,$new_width);

}elseif($height < $width){



Don't mind the messyness of the code, it's still a work in progress. Basically the problem resides in the "//Here is the problem" part. I have an image, that must be resized to a calculated new size. It does calculate the sizes correctly, but then I miss about 20% of the image, the right 20% part to be precise. Click here for an example (Click here for the original file).

Can someone look at the code and tell me what's wrong?


OSNN Veteran Addict
18 Mar 2002
array getimagesize ( string filename [, array imageinfo])

The getimagesize() function will determine the size of any GIF, JPG, PNG, SWF, SWC, PSD, TIFF, BMP, IFF, JP2, JPX, JB2, JPC, XBM, or WBMP image file and return the dimensions along with the file type and a height/width text string to be used inside a normal HTML IMG tag.

Note: Support for JPC, JP2, JPX, JB2, XBM, and WBMP became available in PHP 4.3.2. Support for SWC as of PHP 4.3.0.

Returns an array with 4 elements. Index 0 contains the width of the image in pixels. Index 1 contains the height. Index 2 is a flag indicating the type of the image: 1 = GIF, 2 = JPG, 3 = PNG, 4 = SWF, 5 = PSD, 6 = BMP, 7 = TIFF(intel byte order), 8 = TIFF(motorola byte order), 9 = JPC, 10 = JP2, 11 = JPX, 12 = JB2, 13 = SWC, 14 = IFF, 15 = WBMP, 16 = XBM. These values correspond to the IMAGETYPE constants that were added in PHP 4.3. Index 3 is a text string with the correct height="yyy" width="xxx" string that can be used directly in an IMG tag.

an Example from php.net is
list($width, $height, $type, $attr) = getimagesize("img/flag.jpg");
echo "<img src=\"img/flag.jpg\" $attr alt=\"getimagesize() example\" />";

so it looks like on your list() call you have the $height and the $width getting the wrong values


Glaanies script monkey
Political Access
16 Feb 2003
oops, geffy posted that already, ignore/

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