HDR using 1 Raw file with canon digital photo professional and Dynamic HDR. Original photo taken using 400D with 17-85mm lens
in Canon Digital Photo Professional
step 1 - open Raw file to be processes
step 2 - convert the raw file to jpg as-is
step 3 - open same file in step 1 - reduce Brightness Adjustment to -2. save as jpg (different name)
step 4 - open same file in step 1 - increase Brightness Adjustment to +1.5. save as jpg (different name)
step 5 launch HDR dynamic and combine them ... play around with option... and here is one sample