Thank you for the insight Greg.
Just to clear things up for me as I am still very much new to HDR and Radiance, is the discrepancy in values from the Radiance pvalue output and Photosphere expected? Should the 179 conversion factor be the value to use to convert back from the pvalue output to luminance?
Do you have any more information for me for how photosphere computes the log average in the histogram function? I initially assumed a calculation of (y - x)/(ln y - ln x) but that isn’t giving me a value comparable to what photosphere is outputting.
Thank you again for your help thus far