On 20 apr, 18:27, "r.e.wolff" <r.e.wo...@harddisk-recovery.nl> wrote:
> On Apr 20, 6:22 pm, "Bart.van.Andel" <bavanan...@gmail.com> wrote:
>
> > My first thought about images rendered black was that somehow you are
> > (well, Hugin is) using a wrong value for the EV. Normally you can
> > tweak the EV value (in the preview window, for instance) to alter the
> > brightness of the image. If the EV is set to a very low value, the
> > image will be rendered completely white, and if set to a very high
> > value, it will be rendered completely black. Is this the case maybe?
>
> Ah! checked the PTO, and it's set to zero. This is a very low value,
> so you
> are expecting a completely white image, but it's black. Weird....
Depends. What is really important is the difference between the EV
from the input images and the EV as set in the preview window, maybe
we are referring to different values (I didn't dive into any PTO files
really)...
> > Regarding the final image. I don't know if the zoomed in images cover
> > the entire low res panorama, but if it does, the simplest solution is
> > to remove this image from rendering by clicking the image number once
> > in the preview window. If all positions were already correct, this
> > will leave you with a high resolution panorama with all the data
> > coming from the zoomed in images.
>
> No, the zoomed images cover only the 10 percent "interesting" areas.
> The rest is "grass" and "sky".
Hmm... Well, I can think of a workaround.
1. Render the panorama image, excluding the low res panorama as a
source. Use a low resolution and no interpolation, to speed things up.
Save as TIFF.
2. Use the inverted alpha channel of the generated panorama to
generate a mask for the low resolution panorama. Using some
convolution (thickening/thinning) to make the gaps a little smaller.
3. Finally, render the panorama at full resolution, including the now
masked low resolution panorama.
This is just theory, I haven't tried any of this in practice, but I'm
pretty sure it will work.
Best,
Bart
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