I just watched this video and wanted to chime in. Bruce claims that if you place your textured shadows on Zone III that they will be to compressed and flat. He draws the HD curve (attached)
Originally Posted by Toffle
Bruce Barnbaum and Zone IV placement.jpg
and says by putting them onto Zone IV instead that they won't be compressed because Zone IV is on the straight line portion of the HD curve.
My problem with this explanation is that it assumes that Zone III is always on the toe of the curve. This statement is likely to be the case if you have rated the film at the box speed/ISO. Bruce's solution is to overexpose by 1-2 stops and then print Zone IV down to Zone III.
This explanation tells me Bruce is assuming one is setting the film's ISO to the box speed. He doesn't appear to be encouraging one to rate the film according to the SBR using a quick and easy prescription (WBM Ed1 p. 131), or even the results of one's more elaborate testing. In fact if one chooses to calibrate their film as per the elaborate and precise method in WBM (Ed1 p. 133), the low end of Zone II is aligned with the film's speed point which is 0.17 above FB+F. This then ensures Zone III is in the straight line portion of the HD curve and no compression occurs.
It also doesn't matter whether you choose to identify Zone IV in a scene compared to the darker Zone III, neither zones should suffer compression, or flattening of the shadow details.
Last edited by PeterB; 08-29-2011 at 08:48 AM. Click to view previous post history.