+ /**
+ * Copy the image file to the given destination.
+ * For obscure formats, this will automatically convert to PNG;
+ * otherwise the original file will be copied as-is.
+ *
+ * @param string $outpath
+ * @return string filename
+ */
+ function copyTo($outpath)
+ {
+ return $this->resizeTo($outpath, $this->width, $this->height);
+ }
+