RE: [PanoToolsNG] Dealing with angle of view for scanned images
- You must crop each image exactly the same to achieve a good stitch.
Meaning, you should crop outside the actual negative if possible, to get
good repeatable image positioning and crop again inside hugin digitally to
reduce your margin of error.
>>Also, different views shotwith the same lens will differ slightly in the actual angles of view.
This is vague, and could mean any number of things to me.
For non-fisheye or wide angles, film is tough stuff.
Remember, your photo content means NOTHING to hugin, only your control
points tell how to morph your images to a perfect sphere. So images cropped
differently are hell on optimizing. For example optimizing how much you
messed up your crop on a single image is difficult unless you have covered a
full 360 degrees of control points.. Crop shifting across all images, is not
possible to optimize reliably.. Unless FIRST, you've nailed your crop ONCE
and optimized your true lens parameters.
God help you if you have a zoom lens. :-)
Southern Digital Solutions LLC - Atlanta, Georgia
From: PanoToolsNG@yahoogroups.com [mailto:PanoToolsNG@yahoogroups.com] On
Behalf Of leonard_evens
Sent: Friday, August 10, 2007 4:00 PM
Subject: [PanoToolsNG] Dealing with angle of view for scanned images
I've figured out quite a lot about how hugin works by using a test
image. But to apply it to my photographic needs, I have to
understand what to do with images obtained by scanning negatives. Any
such image will be a slightly cropped version of the nominal dimensions
of the format, and this will affect the actual angle of view slightly
as opposed to the nominal field of view. Also, different views shot
with the same lens will differ slightly in the actual angles of view.
If I allow hugin to determine too many parameters, it sometimes goes
way off, and even when it is only slightly off, it may distort the
relative dimenions in the final image. I want to use this for
accurate archtectural renderings, so I would like to avoid such
There must be some information about how to deal with such scanned
images and the kinds of questions I have. Can anyone direct me to the
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