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function sanitizeExif($im, $whitelist=array()) {
	$alwaysPreserve = array('Copyright',
	                        'ColorSpace',
	                        'Orientation',
	                        'ExifImageLength',
	                        'ExifImageWidth',
	                        'ExifOffset',
	                        'ExifVersion',
	                        'thumbnail:ResolutionUnit',
	                        'thumbnail:XResolution',
	                        'thumbnail:YResolution',
	                        'XResolution',
	                        'YResolution'
	);
	$saveExif = array_merge($whitelist, $alwaysPreserve);
	
	$exifArray = $im->getImageProperties("exif:*");
	
	foreach($exifArray as $name => $property) {
		$test = preg_replace('/^exif:/', '', $name);
		if (! in_array($test, $saveExif)) {
			$im->setImageProperty($name, '');
		}
	}
}