[PanoTools-devel] Theorical question about Exposure Values...

[tennevin y. <ten...@wa...>]

Hello,
I am trying to implement an idea I have since sometimes about enfuse and 
stacks:

The background:
My camera can do 7 different exposure in bracketting mode.

The idea:
Find a way to determine which combinaison of image should be enfused for 
the best setting.

How to determine it:
Test all the available simple possibility to enfuse: equals to  
2^(number of brackets)-1 images.

An example:
http://esby.free.fr/perso/images/temp/EV/list.html

The first seven images are reducted images of the bracket.
The other images are combinaisons of them.
labelled like: P1350354-P1350360-123567.png where 123567 corresponds to 
the bracketted images actually used to make the image in enfuse.

Now the problem:
Source Images are coming with EV in the exif, which are:
Light Value                     : 15.6
Light Value                     : 15.6
Light Value                     : 14.9
Light Value                     : 14.3
Light Value                     : 13.6
Light Value                     : 12.9
Light Value                     : 12.3

This is an interesting feature to compare the luminance, but whenever 
enfuse is used, this information is lost.

Is there any way to artificially calculate this EV or to have a similar 
indicator?
so brackets of same exposure could be assembled later in a panorama.

-- 
Yves Tennevin / esby <dot> free.fr

http://esby.free.fr/contact.html