We all shoot our films, some of us also process and scan it, but I prefer the convenience of the commercial labs for the purpose. Guess my surprise when I got totally different scans from the same roll! This GIMP tutorial covers the basic technique that I used to rectify the problem on one of my first home-made Redscale rolls. Although a digital computer and a software program is used, I do not consider that a manipulation, but rather "fixing" an error that has been made by another computer program elsewhere. We are going to analyze the histogram and based on some basic knowledge about film and exposure, we are going to get the redscale film to look like it was originally intended.