»memory_limit = 500M - sowas macht man nicht!

		$getimagesize = @getimagesize($src_file);
		$memory_needed = ($getimagesize[0] * $getimagesize[1] * ($type['format'] == IMG_JPG ? 24 : $getimagesize['bits']) * $getimagesize['channels'] / 8 + pow(2, 16)) * 1.7;
		$memory_limit = intval(ini_get('memory_limit')) * pow(1024, 2); // if --disable-memorylimit is set this is 0
		$memory_usage = 0;
		if ( function_exists('memory_get_usage') )
		{
			$memory_usage = memory_get_usage();
		}
		if ( $memory_limit && ($memory_needed + $memory_usage) > $memory_limit )
		{
			// try to set a new limit
			if ( !ini_set('memory_limit', ceil(($memory_needed + $memory_usage) / pow(1024, 2)) . 'M') )
			{
				return false;
			}
		}