[url]
index.php?watermark=/var/www/watermark.png

[config]
image_filter_watermark $arg_watermark

[log]
2013/02/22 15:57:09 [debug] 14337#0: *22 http script var: "/var/www/watermark.png"
2013/02/22 15:57:09 [error] 14337#0: *22 watermark file '/var/www/watermark.png[ O'’ç}ˆìf|+ûR¾Ÿ'°b²MU†;Ó8µ;ëâÊÓ«>±~ˆb…·I®z/…_»VÖfùÄfgmÓ&‰ºþ¢Ž§¢@ '