http://pro-av.panasonic.net/en/af100/feature04.html
"The Dynamic Range Stretcher, Gamma Select and other image features have also been inherited from previous Panasonic professional camera recorders."
To Quote Barry Green on DVX:
"The 170, 150, 300 and 370 all offer DRS. It's one of those functions that can be pretty amazing, or not, depending on the circumstances. It works by taming the highlights and gaining up the shadows. But what's really crafty about it is that it doesn't do it globally to the whole picture, it only does it where it's needed -- so it's sort of like having an individual iris over every pixel almost.
The highlight preservation is quite good, but the shadow detail comes at the expense of added noise, just like any other kind of gain."