Where is it? Find the tutorial here.
What is it? A step by step look at how to use the histogram equalization technique to edit low quality pictures and make them more detailed. The enhancement method increases the contrast of the supplied image, a functionality that's almost a basic in today's cameras and by the end of the tutorial you will know how this is done.
What you need to follow? The tutorial is best geared toward people with some prior python programming knowledge. You will also need the python language to be installed on the machine you will be working on.