This script is usefull for dynamicaly thumbnailing images. Its pretty simple. One page that you run your images through. Example


<img src="thumbit.php?image=http://www.mysite.com/images/myphoto.jpg">

Here is the code.


<?php

// Input
$s_image = $_GET['image']; // Image url set in the URL. ex: thumbit.php?image=URL
$e_image = "error.jpg"; // If there is a problem using the file extension then load an error JPG.
$max_width = 100; // Max thumbnail width.
$max_height = 250; // Max thumbnail height.
$quality = 100; // Do not change this if you plan on using PNG images.

// Resizing and Output : Do not edit below this line unless you know what your doing.

if (preg_match("/.jpg/i", "$s_image")) {

header('Content-type: image/jpeg');
list($width, $height) = getimagesize($s_image);
$ratio = ($width > $height) ? $max_width/$width : $max_height/$height;
if($width > $max_width || $height > $max_height) {
$new_width = $width * $ratio;
$new_height = $height * $ratio;
} else {
$new_width = $width;
$new_height = $height;
}
$image_p = imagecreatetruecolor($new_width, $new_height);
$image = imagecreatefromjpeg($s_image);
imagecopyresampled($image_p, $image, 0, 0, 0, 0, $new_width, $new_height, $width, $height);
imagejpeg($image_p, null, $quality);
imagedestroy($image_p);

}
elseif (preg_match("/.png/i", "$s_image")) {

header('Content-type: image/png');
list($width, $height) = getimagesize($s_image);
$ratio = ($width > $height) ? $max_width/$width : $max_height/$height;
if($width > $max_width || $height > $max_height) {
$new_width = $width * $ratio;
$new_height = $height * $ratio;
} else {
$new_width = $width;
$new_height = $height;
}
$image_p = imagecreatetruecolor($new_width, $new_height);
$image = imagecreatefrompng($s_image);
imagecopyresampled($image_p, $image, 0, 0, 0, 0, $new_width, $new_height, $width, $height);
imagepng($image_p, null, $quality);
imagedestroy($image_p);

}
elseif (preg_match("/.gif/i", "$s_image")) {

header('Content-type: image/gif');
list($width, $height) = getimagesize($s_image);
$ratio = ($width > $height) ? $max_width/$width : $max_height/$height;
if($width > $max_width || $height > $max_height) {
$new_width = $width * $ratio;
$new_height = $height * $ratio;
} else {
$new_width = $width;
$new_height = $height;
}
$image_p = imagecreatetruecolor($new_width, $new_height);
$image = imagecreatefromgif($s_image);
imagecopyresampled($image_p, $image, 0, 0, 0, 0, $new_width, $new_height, $width, $height);
imagegif($image_p, null, $quality);
imagedestroy($image_p);

}
else {

// Show the error JPG.
header('Content-type: image/jpeg');
imagejpeg($e_image, null, $quality);
imagedestroy($e_image);

}

?>

I hope this is usefull. If you want to have JPG and GIF images at different qualities and automatically changing PNG to 100% quality then replace the quality variable with the fallowing code.


if (!(preg_match("/.png/i", "$s_image"))) {
$quality = 75; // Set your quality
} else {
$quality = 100; // Do not change this or PNGs will not load correctly
}