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| p.1 #19 · Best way to do bracketing for HDR on 5D MK II? |
Fred Miranda wrote:
But you still need multiple exposures to manually blend.....
Yes but not as many. Two or three exposures should do it.
why would manually blending require less exposures than auto ?
Because you can separate them by several stops, allowing you to cover the full range of a very wide scene DR. If you manually blend major areas from two or three shots, instead of relying on a program to do "local adaptation", there's no need to bracket closely, such as by 1 stop or 1 1/3 stops between adjacent exposures.
Still doesn't make sense to me. I've done auto merge of 2 stop bracketing with photomax. Can you explain in more technical detail what your reasoning is?
Thanks in advance.
If you are happy with what Photomatix gives you from three shots that cover a span of 4 or 5 stops, then there's nothing wrong with that. I've found that PS CS5 sometimes gives a good automated HDR result with three shots that are widely spaced in exposure. But sometimes it doesn't work well at all, and I assume you wanted to do five exposures because Photomatix does better with that. I'm just suggesting that in many cases the software produces odd, unnatural looking tonality in at least some regions *unless* you feed it a 5 or 7 shot sequence. My non-technical understanding is that the software may need to measure the relationships of tones in a greater number of bracketed exposures in order for the algorithm to calculate visually effective contrasts both in small areas and in the whole image. If a 3 shot sequence doesn't work in software HDR, try manual masking and blending. *You* get to figure out where a certain region of your image is best represented by one exposure, another region by a different single exposure, etc. Then you combine them with layer masks, use blending modes, etc. to get the most effective look. Not a tutorial, just a very limited overview, but does it make sense now?