<?php
    $testdatei = $_GET['pid'];
    $size      = GetImageSize($testdatei);
    $new_image = imagecreatetruecolor($size[0],$size[1]);

	if ($size["mime"] == "image/png") {
		$old_image = imagecreatefrompng($testdatei);
	} else {
		$old_image = ImageCreateFromJpeg($testdatei);
	}

	ImageCopyResized($new_image, $old_image, 0, 0, 0, 0, $size[0], $size[1], $size[0], $size[1]);
	header("Content-type: image/jpeg");
    ImageJpeg($new_image, NULL, 100);
?>