PanoTools NG:
Re: Re: view point correction
Eric O'Brien 2007-Nov-26 09:05:41
On Nov 23, 2007, at 7:30 AM, Erik Krause wrote:
> On Friday, November 23, 2007 at 1:28, Eric O'Brien wrote:
>
>> For me, it has worked fabulously. However, since the control points
>> need to be placed manually, and the "offset nadir" shot optimized
>> separately, and an alpha channel needs to be drawn on that image
>> ALSO... the entire process is anything but "snappy." :(
>
> It's only necessary to paint an alpha channel if you use an external
> blender (smartblend or enblend). With the PTGui internal blender it
> is sufficient to decrease blend prority for the nadir image.
This feature seems like a good idea, but in practice I have found it
useless: There is no visualization presented of the boundary that a
given "blend priority" value will create. It takes me far longer to
put the (unrealized) "wrong" value in two or three time (re-stitch
each time) as I try to get a "right" value, than it takes me to go to
the trouble of adding an alpha channel -- where at least I can *see*
and specifically define the boundary.
The alpha channel is ALWAYS right... blend priority is purely guess
work. And until I get a computer that is 10 or 50 times faster, even
two "guesses" costs far more than hand painting that Alpha channel. :(
I have also found that small "blend priority" values gave me very
visible transition zones, and a dark (!) zenith. (I can't figure the
dark zenith... if I didn't adjust vignetting I'd assume that the
center of the zenith image would be *lighter* than the edges of the
other images.)
At any rate, after wasting hours and hours and hours fussing with
"blend priority" I have simply abandon it.
eo
> PTGui
> then uses only the necessary parts to fill the hole...
>
> best regards
> --
> http://www.erik-krause.de
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