iPhone 4s running iOS 7 displays pictures taken with filter as white

Here's a workaround: View the problem photo in your camera roll, click edit, click rotate twice to make the image upside down. Click save. Click edit again, rotate back to normal, and save. Now you have your image back!

Not sure what causes this, but I have the problem also on my 4S. I did find that closing all the apps and rebooting helps.

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.

I had the same problem with my iPhone 4s. If all the iPhones are connected to the same iCloud account, you have to wipe out everything and start over (as the apple store told me). I had a warranty on mine, and went through about 4 different iPhones with the same problem, including the camera not even working at all and just showing a black screen. Then, the apple store told me they had done everything they could and the only thing to fix it would be to wipe out all information and set up a new iCloud. I can't tell you if it worked or not because I didn't want to lose everything so I never fixed it.

Opening it and tapping "edit" brings it back but you have to apply another filter or magic touch for it to stick around.