Assisted photo capture with contrast/brightness filter

The function is to take a picture and then apply a filter to the picture. the order of the user activity is to 1) take a picture 2) select filter (we are only asking for you to make 1 filter, but we may have more in the future) The application will then save the picture to the device with the applied filter In the camera capture screen, there should be a circle guide visible to help the user center the picture (see attached photo "[login to view URL]" after the photo is captured, the next screen is to choose a filter. You will help us make only 1 filter, so there will only be 1 filter to select. The layout of the filter selection should be similar to instagram (see attached photo "[login to view URL]") The filter we want is a contrast/brightness adjustment. Outside of the line that was used as a guide, the photo should be darkened. Inside the circle the photo should be lightened. Across the line, there should be a gradient fade of contrast to smooth the previous 2 changes. The amount of darkening, the amount of lightning, and the size of the radius of the gradient should all be code adjustable (so we can later decide what ratios we want).