Reverse Filtering?

I really love the filters on this app. They are super great and make the pictures really cool looking. I just dont like how you have to choose a filter AND THEN take the picture. I usually like to take the picture and then experiment with the editing later.... When I take pictures, theyre usually in the spur of the moment, and they need to be quick shots. I dont have time to mess with the filters before I take the picture. I know theres a way that you can adjust the filter and then use a picture already taken, but if you dont like it, then you have to exit out and choose another filter, then reload the picture. Doesnt that just seem like an unnecessary extra step?
This is a great app, and I believe I bought it on sale for 99 cents, but there are free apps that let you load the picture and then test out all the filters. They dont always have the best settings, but theyre free. This costs money, and I just ask for this one quirk to be fixed. Is that possible?

Or if Im completely challenged and stupid and there actually already is a way to accomplish what I want to do, could anyone tell me?

BolinInTheDeep about Booster!