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RewriteEngine on
RewriteCond %{REQUEST_FILENAME} !\.thumb\.|\.highlight\.
RewriteRule ^.*[Jj][Pp][Gg]$|.*[Gg][Ii][Ff]$|.*[Pp][Nn][Gg]$ watermark.php?%{REQUEST_FILENAME}

<?php

// watermark.gif should have a transparent background.
$watermark = "watermark.gif";
$image = $QUERY_STRING;

if (empty($image)) die();

if (!file_exists($image)) {
header("404 Not Found");
echo "File Not Found."; die();
}

$outputType = getFileType($image);

watermark($image, $watermark, $outputType);

/**
Outputs the image $source with $watermark in the lower right corner.
@param $source the source image
@param $watermark the watermark to apply
@param $outputType the type to output as (png, jpg, gif, etc.)
defaults to the image type of $source if left blank
*/
function watermark($source, $watermark, $outputType="") {
$sourceType = getFileType($source);
$watermarkType = getFileType($watermark);

if (empty($outputType)) $outputType = $sourceType;
if ($outputType == "gif") $outputType = "png"; // Okay to remove
header("Content-type:image/$outputType");

// Derive function names
$createSource = "ImageCreateFrom".strtoupper($sourceType);
$showImage = "Image".strtoupper($outputType);
$createWatermark = "ImageCreateFrom".strtoupper($watermarkType);

// Load original and watermark to memory
$output = $createSource($source);
$logo = $createWatermark($watermark);
ImageAlphaBlending($output, true);

// Find proper coordinates so watermark will be in the lower right corner
$x = ImageSX($output) - ImageSX($logo);
$y = ImageSY($output) - ImageSY($logo);

// Display
ImageCopy($output, $logo, $x, $y, 0, 0, ImageSX($logo), ImageSY($logo));
$showImage($output);

// Purge
ImageDestroy($output);
ImageDestroy($logo);
}

function getFileType($string) {
$type = strtolower(eregi_replace("^(.*)\.","",$string));
if ($type == "jpg") $type = "jpeg";
return $type;
}
?>