diff --git a/lib/quickthumb.js b/lib/quickthumb.js
index 00581b2..074f4e9 100644
--- a/lib/quickthumb.js
+++ b/lib/quickthumb.js
@@ -106,7 +106,7 @@ qt.static = function(root, options){
                     width : dims[0],
                     height : dims[1],
                     type : options.type,
-                    quality : options.quality
+                    quality : (req.query.quality !== undefined && !isNaN(parseFloat(req.query.quality))) ? parseFloat(req.query.quality) : options.quality
                 };
 
             qt.convert(opts, function(err, dst){