Ya... But from wat i know....still photos after captured, it will not be presented... But just dunno is it normal for it to remain in a video after capture on ixus 70
"To date there is no clear single item that is responsible for purple fringing. We do know that is most likely to happen when apertures of greater than f/4 are used, when a wide angle of 28mm (or equivalent) or wider is used and when the subject to background contrast is high. Since it is most likely to happen under those conditions, avoid that combination if possible. To remedy some of these problems it seems to be most advisable to use a lens hood or shield the lens from light raking directly a crossed it."