Also, I'm metering on the 3rd darkest grey square and then bracketing. When I look at the files RGB values, a darker exposure gives me a value closer to the value of the 3rd darkest square. How do I determine the correct exposure?
Eric Chan quite recently suggested (wrong word, as he is the developer or one of them it is not a suggestion, but rather an instruction) that the right exposure is the "brightest" one that Adobe DNG PE will still accept w/o error message... It has some internal checks implemented... so just make several shots gradually approaching clipping in 1/3 EV increments and the most ETTR'd one that PE still accepts is the right one... brute force... if you are using the software from XRite then I do not know the answer, but I 'd suggest to try Adobe PE first and then try the shot that was the best for Adobe PE for XRite profile creator.
