Op za 13 mrt. 2021 om 17:20 schreef 'Kay F. Jahnke' via hugin and other
free panoramic software <[email protected]>:
>
> If your job requires only 1:1 or
> less, try passing --build_pyramids=no, which should reduce the memory
> footprint and be faster as well.
>
> And you can also try and omit the separate 'quality' interpolator by
> passing ---quality_interpolator_degree=1 - the default of three is to
> give you nice magnifications for still images up to single pixels blown
> up to screen size :D
>
> Using
--build_pyramids=no \
--quality_interpolator_degree=1 \
makes it faster and decreases memory from 3.7GB to 3.2GB. It also helps to
not completely block my laptop.
I also used the new --snapshot_threads and set it to 3.
However, pv still uses all 4 cores/threads and when I "time" the command it
is exactly the same as without this parameter.
> The next point to consider is mathematics: if I remember correctly,
> enfuse uses a highly optimized integer-math implementation of the B&A
> image splining algorithm - and it may even offload work to the GPU,
> which would explain why it blocks up your system less - pv is CPU only,
> and does all calculations in single-precision float, and with pyramid
> levels based on cubic b-splines. That's a lot of CPU load, with the SIMD
> units running on all threads you put to use.
>
>
enfuse/enblend uses OpenMP.
> I don't look at the
> masks in the PTO yet, but you should now be able to simply feed images
> with unwanted content 'erased' to transparency (should even be best with
> a feathered brush on the erase tool), and as long as the other images
> provide content, the 'ghosts' should become invisible, thanks to the B&A
> magic.
>
I do not entirely understand what you mean. Do you mean I should erase some
unwanted part in one of my bracketed images? or does pv that? Or do you
have to do that in the live view?
This is really interesting. I personally like sunrises and sunsets. You
mostly need bracketed sets to get a good dynamic range.
They sometimes contain unwanted parts or enfuse (up til now my used
program) does not pick the part I want. I sometimes fall back on hugin for
its use of masks. (enfuse does understand masks, but I do have to create
them in hugin so I can just as well finish in hugin)
So: Do you have such images (with pto) as example that shows this
functionality?
Harry
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