'PhotoTorch' Lets You Manually Adjust the Flash Intensity for Photos
Instead of whitewashing your photographs with an overly-bright default camera flash intensity, why not give yourself some control over just how bright the camera flash will be when you want to take a photograph to reduce whitewashing and glare?
A new free jailbreak tweak called PhotoTorch
by iOS developer PoomSmart lets you do this. PhotoTorch adds a new feature under the Options button in the Camera application so you can adjust the brightness of the LED flash for your photographs via an orange slider bar.
Another benefit to the tweak is that you can see in real time via the iOS device display exactly what the photograph is going to turn out like with the default LED flash enabled. This way you won’t turn out being surprised by an overly bright or overly dark picture in the end.
You can enable and disable the tweak on demand from the preferences pane in the Settings application, as well as enable a feature called 'No Flash Fire,' which will keep the default LED flash feature from initiating when you take a photo; rather, the "torch" or manually-adjusted LED flash option, will simply remain lit so you can focus on what the photograph will look like when you take it.
Notably, the tweak only works in the Camera application, and not from the SpringBoard camera such as via the lock screen. If you're interested in giving it a try, you will find it for free in Cydia's BigBoss repository.
iPhone 4, iPhone 4S, iPhone 5, or iPod touch 5G running iOS 6