[ptx] Best way to compensate for different exposure/metering/white balance settings

[Aunty Ethel's pet hamster]

On Wed, 26 Jul 2006 11:24:51 +0100, "Bruno Postle" <bruno at postle.net>
said:
> On Wed 26-Jul-2006 at 11:01 +0100, carbon14 at fastmail.fm wrote:
> >
> > I'm trying to create a panorama out of five photos that I took recently,
> > but unfortunately I took the photos before reading about fixing the
> > metering/white balance when taking shots for a panorama.
> 
> You can automatically correct exposure if you use either the 
> PTStitcher or PTmender stitching engines instead of nona (the 
> default hugin stitcher).
> 
> Though you will get even better results if you use 'enblend':  On 
> the 'Stitcher' tab, select Quick Stitcher -> High quality TIFF
> 
> -- 
> Bruno

Unfortunately, the finished panorama that contains these vertical
gradients (http://www.carbon.eclipse.co.uk/panorama.jpg) was stitched
using enblend (I followed the tutorial at
http://exolucere.ca/articles/create-panorama which said to do the
stitching using enblend from the command line).

I've since tried the "Quick Stitcher -> High quality TIFF" option to see
whether that improves things, and the output tiff still has the same
problems.

I was wondering more whether it's possible to use the information
contained in the exif data (such as ISO Speed data, ExposureTime and
FNumber) to modify the photos _before_ passing them into
autopanog/hugin/enblend. As an example, two adjacent photos have
exposure times of 1/127 seconds and 1/92 seconds (not surprisingly, the
second photo appears too light in the panorama) but I don't know how to
"normalize" these two photos to have the same exposure time (and even if
I did, would they then blend better?). I think I'll try the Gimp mailing
list next, if no-one has any suggestions.

Thank you.

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