Adjusting image Brightness and Contrast, or turning image into Grayscale or Sephia is a common feature you may find in image editing application, like Photoshop. But, it is now possible to add the same effects to web images using CSS.
This capability comes from the Filter Effects which actually is still in the Working Draft stage. However, the Webkit browser seems to be a step a head in implementing this feature.
Another alternative to Photoshop, ladie and gentlemen. Using CSS you can perform a brightness and contrast adjustment as well as changing the color from grayscale to sephia. The demonstration in this article, clearly states just how uncomplicated it can be.