proj-imim:
[proj-imim] Re: Underwater Pan, flat or immersive ?
Jook Leung 2002-Oct-19 23:31:21
Hello Romuald and all.
Expressing the spherical panorama in print form has been a quest for me too.
The equirectangular format (or Mercator projection) of the sphere has too
much visual distortion at the poles. A visual solution is remapping the
equirectangular to a 4pi Steradian (or Hammer projection) image.
I first saw this on a page by Tetsuya Uwai:
http://nagoya.cool.ne.jp/uwai/4pi%20steradian%20images/1st_trial/4pielps....
jpg
I have a page explaining 4pi Steradian:
http://360vr.com/4pi/4pi.html
We can also slide the wrappped panorama left or right with the Offset PS
filter to recompose our image.
http://360vr.com/iapp-wv-w60/10-loc-slide1.jpg
We can also use PTools PS Adjust or Remap filter to recompose the
compostion based on tilt and roll too.
http://www.panoguide.com/technique/circular.html
Another projection is called hyperbolic. "Hyperbolic space is an infinite
space projected onto a finite volume of space."
http://graphics.stanford.edu/papers/h3/html/node4.htm
This projection is easily accessible from Flaming Pear's Flexify PS filter.
http://360vr.com/iapp-wv-w60/19-wg-hyberbolic-slide.jpg
The hyperbolic projection is my favorite as it is visually quite stunning
for prints. http://360vr.com/flagstaff2
http://360vr.com/light2
Dan Slater http://www.nearfield.com/~dan/photo/wide/sphere/index.htm
and Ford Oxxal http://www.pictosphere.com/what_is_circular_perspective.html
have also showed various spherical projections.
This should keep everyone busy for a while ;-)
>Jacek Gancarson a wrote :
>
>> ...
>> BTW. Me, As a last century newcomer, i prefer Ptviewer displays, or, as one
>> can call them - dynamic views, on a computer screen.
>> So the first think I made after I came to the pano site, I save the image
>> and placed it in PTviewer in order to know little bit more about the place.
>
>I did that too, for sure, but as Malcolm spoke about printings, I decided
>not to present a dynamic view. And more ....
>
>> .....Sorry friends, I am totaly out in printing of panoramic canvases. I
>>know
>that it is a strong aestetic bias and tradition but how theh... one can
>perceive spatial information from them? <
>
>For printing, you don't have to try interpreting spatial info ( in this
>case, anaglyph are better).
>I noticed that a lot of people are definitely disturbed by flat 360
>prints, if you told them. But this remains my favorite way to
>share "true" images instead of "virtual". So I decided Not to tell : <
>this image is a pano, look at the edges, they stitch ! >
>At least for landscape, the trick is only detected by panoramists or some
>photographers. And those images are often interesting (apart
>subject), particularly the light, which provide some special caracter.
>
>The image Malcolm showed us is absolutely composed for printing.
>
>The 2 differents ways, flat or immersive, are not opposed. I just think
>that flat version lets you more freedom to express any
>message you want to tell.
>The immersive is An action, the flat is Your thought. But may be I'm not
>good enough to express ideas in dynamic views.
>just my 0.02 euros
>
>Congratulations to Malcolm.
>
>
>Romuald
JOOK LEUNG --> #removed# Panoramic photography --> http://360vr.com
Subscribe & Unsubscribe at: https://listserv.fh-furtwangen.de/cgi-bin/lwgate/cgi/lwgate-en.cgi/dbase...