Centering and cropping of large black areas [was: Re: [ptx] thoughts for hugin UI, post 0.5]

[douglas wilkins]

--- Pablo d'Angelo <pablo.dangelo at web.de> wrote:

> Hi all,
> 
> douglas wilkins wrote:
> 
> > 
> >>To do this you'll want to hit the "Center" and "Fit" buttons on the
> >>preview pane, that should do exactly what you want, but there are a
> >>few bugs with it that I'm aware of:
> >>
> >> - if the panorama is more than 180 degrees (i think), it stops working
> 
> Should work better with rc1. If it doesn't work in the way you expect 
> it, please let us know. Remember that it only centeres horizontally, 
> because only that makes sense for all projections.
> 
> >> - the horizon of the panorama is *always* mapped to be exactly on
> >>that center line in the preview pane, so even if you use the
> >>center/fit buttons, if your panorama's horizon is near the bottom of
> >>the pano, then you'll end up with a big empty space at the bottom of
> >>the panorama (eg, the horizon will be the middle of the output always,
> >>so if the horizon is near the bottom of the photos, then the top half
> >>of the output will be your pano, and the bottom half will be a blank
> >>space, because the horizon is in the center). I hope that makes sense.
> > 
> > 
> > It does to me :-) 
> > Perhaps we need to add an "horizon offset" adjustment in the preview?
> 
> This is a different question. The center lines in the pano indicate the 
> direction of the virtual "panorama camera". Actually, the position of 
> the input images is changed, not that of the virtual camera, but the 
> result is the same.
> 
> If the "virtual camera" is pointed up and down, "strange" distortions 
> will appear to the image.
> 
> For example, when hugin is used to get nice verticals in architectural 
> photography, the "virtual camera" is oriented perpendicular to the front 
> of the building. If the camera points onto the middle of image, to 
> minimize the black areas, typically it won't be oriented perpendicular
> to the front anymore -> converging vertical will appear.
> 
> The "architectural projection" (I'm not sure about the name) tutorial
> on the hugin site shows that.
> 
> What we really need is a "crop" function, build into the stitcher and 
> preview window, that works just on the final pano image. This effect 
> cannot be archived by rotating the virtual camera.

I wasn't thinking this through on my first reply. The crop function is a much
better idea. :-)

regards,
Doug




	
	
		
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