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How do I fix this sudden purple thingy . It suddenly appears and then dissapears and then appears again and then dissapears.       <a href="http://www.freeimagehosting.net/commercial-photography/texas/houston/"></

I would like to know how do I fix this noise problem http://.[img]http://s7.postimg.org/eafc7kytz/IMG_20150625_230154_1435245061317.jpg even at low iso's of 200.