"I work in Gimp, a free photo editing program very similar to Photoshop. The first thing I do is duplicate my layer and change the new one to soft light mode, then I work on its transparency level. I try to not over do it, so I start with it on 100% transparency, so that the changes are invisible, and then I gradually decrease transparency until I’m happy with the result. This gives me a more controlled, less hard contrast tool." Read more on the blog.