iPhone 4s running iOS 7 displays pictures taken with filter as white
If you have tried all the above with resetting your camera settings and iPhone settings you might need to restore the whole iPhone. I used to see this a lot in iOS 3 and 4 where you could take pictures but they save as blank/white images. Fix was in those OSes and iDevices to DFU restore the sucker without restoring from a backup sorry to say.