A view from what I believe is known as the Main Terrace. I couldn't have asked for better clouds/sky during my brief Yellowstone visit!
The bright white surfaces of the terraces create quite a challenge for the photographer. One can use fancy grads-- or as I did in this case, use HDR to capture the broad dynamic range. Five frames were used to create the HDR. I had four different tone-mapped hdr layers blended down onto the 0 EV frame. I used both Photomatix and Dynamic Photo HDR tone-mapping operators.