Bill, the foreground snow is very slightly gray, but look farther back at the highlights. There are places back there where the snow is nearly blown. Bring the image down onto your computer and load it into ACR. If you try to raise the tones globally you'll eliminate any detail in the cloud in the upper left immediately, and local mods easily can trash the whole thing. Overall, the range of brightnesses in this picture is almost flawless. As I pointed out earlier, though, printing is a different matter, and might require some further adjustments once paper white is in the picture.