Intéressant.

mais que signifie exactement ceci:

DB: One of the advantages of moving to a full-frame sensor with a relatively low megapixel count is an improvement in high ISO noise levels. Canon is claiming a two stop gain in high ISO performance when compared to the 1D Mark IV. Will we see the full two stops when shooting RAW files, or is this limited to JPEG files only?
CW: To get the full two stops of improved performance you’ll need to shoot in the JPEG format. That’s not to say that high ISO performance isn’t significantly better when shooting in RAW, because it absolutely is.