You should always shoot in RAW, jpeg is just a veiwing format and compreses the picture every time you save it. When you edit a picture in RAW you are actually only editing the "formula" by which the picture will converted to either jpeg or tiff. tiff stands for "tagged image format" and is a lossless format and is another format that you could do your editing.


This isjust normal noise. Try using DDP it has very good noise reduction, it has seperate control of the white noise and the colored noise.