On Wed 09-Dec-2009 at 10:54 +0100, Oskar Sander wrote:
>
> 1. I would like to merge the lines manually in a program like Gimp 
> or Photoshop as different layers.  Is it possible to get the 
> negative space (black) of these uncropped lines as transparent 
> alpha channels straight out of hugin?  Maybe this is what already 
> happens in the output?

Yes, Hugin creates images with an alpha channel which is transparent 
in the 'black' areas.

> 2. Some parts become more smeared than would be expected based on 
> the quality of the photos, see for example the mid section of this 
> strip [3].  I recollect a discussion here that if the overlap of 
> images are large, image fusion would be done rather than seam 
> blending. Is that so and is there a way to prioritize seam 
> blending?    In this case when the images are not perfectly 
> aligned, the fusion would just smear.

No, by default Hugin always uses seam blending with enblend, it 
only uses fusion with enfuse when it finds well-aligned bracketed 
stacks.

Alternatively if you select 'blended then fused' it will seam blend 
images with a similar exposure, then fuse all these layers together 
at the end.

..but I don't think either of these things is happening here.   
Basically enblend isn't very good at joining a blurred photo with a 
sharp photo because it blends each level of detail separately - You 
get a sharp transition between small scale detail which is normally 
not noticeable.

This may be a case where you could try blending entirely with enfuse 
instead of enblend (just swap the executable names), the transitions 
between photos will be more noticeable but sharper photos will 
dominate.

-- 
Bruno

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