https://www.youtube.com/watch?v=gBetG9lvMkg https://www.youtube.com/watch?v=qCnRh6tr-Vc https://www.youtube.com/watch?v=UcElYhmeutw Photoshop노이즈를 제거해주는 필터 filter - Noise - Reduce Noisefilter - Blur - Surface Blur