Playing around with the RAW vs JPEG comparison. On my 5DIII, I save RAW to the CF card and JPEG to the SD card. So, I went back to a recent shot that I knew I had underexposed. I then used the "auto" tool to adjust exposure which selected:


Then I applied those same settings to the RAW image. Looking at just the cockpit of my kayak, there is a substantial difference in the amount of detail.


Processed from JPEG


Processed from RAW


Neither is great, and you can see where data is completely lost in the image. But, definitely more data is available (and in need of noise reduction) in the RAW file.