gzip image files

I create a png dynamically - store the path in mysql. And want to be able to offer the user a zipped version to download Unfortunately haven't been able to get it to work up until now ! I'm sure it's something obvious but........... Open the png $data = fopen('kunden/'.$name.'.png', "rb"); encode it $gzdata = gzencode($data); where to write $fp = fopen('kunden/zip/'.$name.'.gz', "w"); write it fwrite($fp, $gzdata); fclose($fp); what happens is the name gets included in the gz but written to it is only kunden/example.png Can anyone help ?? thanks in advance regards keith