Ive only used ColorStory for about 3 weeks, but I am very pleased with the results of this app. "Brighten" is my favorite setting option and "sharpen" definitely does its job. My only complaint is that you have to "ok" every setting change, which I forget to do sometimes, so I have to go back to make adjustments again and then "ok" to move on.
MHamFam about A Color Story: Photo + Video