Best interpolator ?
JPS
I just downloaded PTGui V9 and had a look of the new settings... One
thing I noted was that the new version offers many more options in the
"Interpolator" part of "Create Panorama > Advanced" !
In the previous versions we had:
Bicubic softer
Bicubic normal
Bicubic sharper
Lanczos
Bilinear
...and in the new one:
Bicubic softer
Bicubic normal
Bicubic sharper (Poly 3)
Lanczos2 (Sinc16)
Lanczos3 (Sinc36)
Lanczos4 (Sinc64)
Lanczos8 (Sinc256)
Lanczos16 (Sinc1024)
Spline (16)
Spline (36)
Spline (64)
Bilinear
Nearest Neighbour
I would like to know -if possible in simple words- what the
interpolation is used for ? ...and which is the best choice (for
which end results) !
Maybe it's a silly question, but I'm quite sure I'm not the only one
puzzled about this...
TIA,
J-P.
ZeBoxx
quality vs time taken argument, but as an introduction to what the
terpolators are for and what some of the more common ones may result
in, you can use Helmut Dersch's years-old comparison page:
http://www.all-in-one.ee/~dersch/interpolator/interpolator.html
On Oct 22, 1:25 pm, JPS <jpscher...@infomaniak.ch> wrote:
> Hi !
>
> I just downloaded PTGui V9 and had a look of the new settings... One
> thing I noted was that the new version offers many more options in the
> "Interpolator" part of "Create Panorama > Advanced" !
>
JPS
Now, it seems that they consider Lanczos8 (Sinc256) as the best of
all ! Of course, being oldish, the text doesn't include tge newer
Lanczos16 (Sinc1024 !
I have tested the various Lanszos interpolators in PTGui 9 Beta -on
the same image and at 200% zooming- and it seems to me that, although
the Sinc2506 is indeed sharper than the previous ones, it does
introduce some kind of "oversharpening" effect on the edges...
Could someone be so kind to test the different interpolators in PTGui
9 and confirm ?
TIA,
J-P.
Erik Krause
> I have tested the various Lanszos interpolators in PTGui 9 Beta -on
> the same image and at 200% zooming- and it seems to me that, although
> the Sinc2506 is indeed sharper than the previous ones, it does
> introduce some kind of "oversharpening" effect on the edges...
Yes, this is the case for all interpolators that are sinc based. In the
diagrams on http://wiki.panotools.org/Anti-aliasing_interpolators these
are the curves which extend below 0.
Jim Watters extended the interpolator test to the interpolators which
where added to panotools later:
http://photocreations.ca/interpolator/index.html
The new PTGui 9 interpolators resemble the "old" panotools ones, with
the difference that the PTGui ones are anti-aliasing.
On aliasing see http://wiki.panotools.org/Aliasing
However, no interpolator is perfect, specially the sinc ones - although
very good for small details - tend to produce artifacts:
http://wiki.panotools.org/Interpolation
--
Erik Krause
http://www.erik-krause.de
Sacha
using for an extraction / retouch / insert process due to visible
sharpening differences for the "new area".
On Oct 29, 8:59 am, Erik Krause <erik.kra...@gmx.de> wrote:
> Am 29.10.2010 12:04, schrieb JPS:
>
> > I have tested the various Lanszos interpolators in PTGui 9 Beta -on
> > the same image and at 200% zooming- and it seems to me that, although
> > the Sinc2506 is indeed sharper than the previous ones, it does
> > introduce some kind of "oversharpening" effect on the edges...
>
> Yes, this is the case for all interpolators that are sinc based. In the
> diagrams onhttp://wiki.panotools.org/Anti-aliasing_interpolatorsthese
> are the curves which extend below 0.
>
> Jim Watters extended the interpolator test to the interpolators which
> where added to panotools later:http://photocreations.ca/interpolator/index.html
>
> The new PTGui 9 interpolators resemble the "old" panotools ones, with
> the difference that the PTGui ones are anti-aliasing.
Ken Warner
imaginary pixels that can be perceived as similar enough to
the surrounding pixels as to be seen as real parts of the image.
There is no best interpolator. It's all a matter of perception.
I tend to use the Lanczos 3 interpolator. I like slightly crisp
edges. That can cause shimmering when rotating a pano but I like
the crispness of the edges when not panning.
To my eye, all the interpolators beyond the bi-cubic and Lanczos 3
look about the same with the larger window sinc interpolators sometimes
looking smoother across large areas of similar color like sky or walls
while still keeping the crisp edges that I prefer.
But it's all individual preference. Pick the one you like and go with it.