Bruno Postle wrote:
On Wed 19-Dec-2012 at 12:13 +0100, Frederic Da Vitoria wrote:
But now that I think of it more closely, I understand that JohnPW's question is
still unanswered and that my answers completely missed the point. I expect the
faux-bracketing to keep the lightest parts of the darkest exposure and the
darkest parts of the lightest exposure.
I'm not entirely sure what you are trying to do, but Hugin will extract
'bracketed' exposures from any photo. By default it uses a 'sigmoidal' camera
response curve to map the data to linear space, multiply and then map back
again - This curve will be quite accurate if you have calibrated your camera
photometric parameters.
All you have to do is load your photo and increment Eev for the input or output.
You can then enfuse these brackets, but this process only really makes sense if
you start with 16bit per channel data created from RAW.
I don't think that's true. I believe (or at least strongly suspect ;-) ) that
by applying steep contrast curve
to different tone segments and then using enfuse, I can achieve *localised*
contrast enhancement, in mid tone
as well as in shadows and highlights.
From JohnPW's other comments, it looks as if I may want to do something
other than ImageMagick's sigmoidal mapping on the two extreme synthetic
brackets.
BugBear
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