Here's how you can change shooting formats and use filters in the camera app for iOS 7.
1. Open the camera app.
2. To change the shooting format, just swipe along the format bar.
3. You have the following shooting format options:
4. To use a filter, just tap on the filter icon in the lower right corner.
5. Here's a list of the available filters in iOS 7:
You can also remove a filter later on if you find you prefer a photo without it.