Hello

I'm making a website for a client which requires resizing artwork.

My problem is that the quality of the resized image is very bad.

For example, this is original image:
http://www.iskm.com/test/test.jpg

It is already smaller than the max width and height restrictions I place on the image. Therefore, it should not be resized at all.

Even so, the quality is reduced!! See here:
http://www.iskm.com/test/index.php

The code which generates the image is this:

PHP Code:

echo '<img src="resize_image.php?image=';
           echo urlencode($image);
echo '&max_width=400&max_height=600" >' 


What causes the quality reduction? I assume it happens when the resize script (appended for everyone's delight) decompresses, resizes and resizes (which is, roughly what I think resizing scripts do).

I got the script for a PHP book.

Cheers
Hamish

Appended resize script (called resize_image.php):

PHP Code:

<?php

  $image = $_REQUEST['image'];
  $max_width = $_REQUEST['max_width'];
  $max_height = $_REQUEST['max_height'];

  if (!$max_width)
    $max_width = 80;
  if (!$max_height)
    $max_height = 60;

  $size = getimagesize($image);
  $width = $size[0];
  $height = $size[1];



  $x_ratio = $max_width / $width;
  $y_ratio = $max_height / $height;

  if ( ($width <= $max_width) && ($height <= $max_height) ) {
    $tn_width = $width;
    $tn_height = $height;
  }
  else if (($x_ratio * $height) < $max_height) {
    $tn_height = ceil($x_ratio * $height);
    $tn_width = $max_width;
  }
  else {
    $tn_width = ceil($y_ratio * $width);
    $tn_height = $max_height;
  }

  $src = ImageCreateFromJpeg($image);
  $dst = ImageCreate($tn_width,$tn_height);
  ImageCopyResized($dst, $src, 0, 0, 0, 0,
      $tn_width,$tn_height,$width,$height);
  header('Content-type: image/jpeg');
  ImageJpeg($dst, null, -1);
  ImageDestroy($src);
  ImageDestroy($dst);

?>

Use ImageCreateTrueColor here: $dst = ImageCreate($tn_width,$tn_height);

Thank you very much! That works perfectly.

Kind regards
Hamish