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Saloula,

Layer masks are at the heart of Photoshop. Leaning to use them puts you in control of adjustments of most any kind. You can control application of filters (which can be considered destructive unless you use Smart filters). Apply a filter to a layer, then apply a mask and paint in the areas where you want the filter effect if not on the whole layer. For your issue I didn't post my result as we encourage OP's to do their own work and learn from the replies. I used a levels adjustment layer, but could have used other methods such as the brightness and contrast layer as gedstar posted. That's the beauty of computers, usually several different ways of doing things to arrive at the same result. Here is a link to the more info on the subject http://www.photoshopessentials.com/basics/layers/layer-masks/