Etienne Monneret (Perso)
Le 27/11/2020 à 11:13, Antonio F.G. via groups.io a écrit :
On Thu, Nov 26, 2020 at 04:41 AM, Etienne Monneret (Perso) wrote:
It depends on the quality of the source.
If this is a cha-cha, you may have important local deformations.
With stereo dedicated hardware, you may have time shift, lens differences, bad aligned mirrors, focal or zoom differences.
There are many reasons why an original may not be perfect!
Or badly shots.
The background is a flat wallpaper, and yes, Spider-Man itself is not well aligned.
The whole image can be "at-best" aligned, but it's impossible to get it "perfectly-aligned" without doing a complex morphing.
The composition would surely require adjusting the depth of the Spider-Man
The original is "at it is", and you can't change the relative
stereo position of the foreground with the background without
doing a morphing. Whatever you do with simple transformations (translation,
rotation, scale, width, height, etc), Spider-Man will always stay
in front of the background.
It's completely dependant on the source.
Of course, if you have a perfect stereo original, you won't have to use them.
In fact, there is one case where you would need it, even with a
perfect hardware: with an hyper-stereo near first plan. When
shooting from too near positions for the first plan regarding the
space between lens (too large for that distance), parts of the
image will be nearer on one side than the other side, and when say
nearer say larger. You will then be obliged to balance the
alignment to keep with these larger/smaller parts, as we did with
the Spider-Man example.