Forum:
Q & A
Thread:
SPi-V - cool feature
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Re: SPi-V - cool feature
Posted: 15 Dec 2005 at 13:25 GMT
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Usually, SPi-V is smoother (not so shaky).
Possible reasons:
- Andrey used an "experimental feature"
- dealing with 2 images (rather than a single one) makes things slower
- Andrey neglected the "power of two" rule, that is:
512, 1024, 2048, etc pixel sizes are very fast.
Something like 1536 (= 1024 + 512) is rather fast.
Prime numbers pixel sizes are terrible.
SPi-V uses your video card and above all uses your video card "video memory". SPi-V is for gamers which like panos? SPi-V is for pano photographers which like games?
My answer: you can't avoid buying one such card, installing a slower card on your (new) computer would cost you much more! On peut pas arréter le progrès!
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Forum:
Tips & Tricks
Thread:
Polar projection for equirectangular panoramas
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Re: What should I see?
Posted: 14 Dec 2005 at 15:35 GMT
updated: 14 Dec 2005 at 15:38 GMT
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First attempt:
Open bolshoy_dev_projection1.html: (fine but) usual pano.
Open bolshoy_dev_projection2.html: can't see the difference with projection1, despite I opened each version in a different window for easier comparison.
Close both windows.
Second attempt:
Open bolshoy_dev_projection1.html: unusual (but interesing) view of "the whole thing in a circle". This is a projection mode which I don't know the name, where one can see "the whole sphere" displayed as a circle. Nadir is in the center of the screen, image can be rotated around nadir.
Open bolshoy_dev_projection2.html: OK, now I see a difference, and clearly projection2 is the best!
So that I suppose the second attempt was right and wonder what happened in the first attempt...
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Forum:
Q & A
Thread:
PTGui 360 X 180 with Sony DSC F828
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Re: PTGui 360 X 180 with Sony DSC F828
Posted: 13 Dec 2005 at 9:55 GMT
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Great 360x180 panorama!
You found the perfect place for (I suppose) your first attempt: many details and many straight lines both in the foreground and in the background plus some other interesting challenges in lighting, etc... (I'm jealous!)
About the black hole: when using Pano2QTVR you can select the TIFF option for the cube faces and edit the "ceiling square". If you can't shot the zenith using your tripod let you make this shot with the camera hand-held. "PATCHING THE ZENITH AND NADIR" paragraph in John's tutorial homepage.ntlworld.com/j.houghton/360tute.htm explains that for fisheye lens, but it's just easier when using a non-fisheye lens.
About your camera and tripod: I wonder if, using all those machine tools, a 6° "angular adjusting chim" to be inserted between your tripod and your camera could not be made...
Regards / Georges
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Forum:
Q & A
Thread:
should I get a tripod head?
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Re: should I get a tripod head?
Posted: 11 Dec 2005 at 19:20 GMT
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A John said, it depends of the subject. Besides that,
- a monopod is better than nothing
- a tripod is better than a monopod
- a tripod + head is better than a tripod alone.
In desperate situations (nothing but your camera, foreground must be included) remember of: www.philohome.com/tripod/shooting.htm
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Forum:
Q & A
Thread:
so many stitchers, which one??
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Free stuff
Posted: 9 Dec 2005 at 17:38 GMT
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Besides PTLens (new version), Autopano, Enblend and Smartblend (new version), I recommend:
Autostitch: the easiest one (but, of course...)
Hugin: can stitch anything, better and better, can use Nona and Panotols, wide range of tutorials, several languages
SPi-V is my preferred viewer: very fast, no cube to build, very interesting experimental features.
Besides that it's impossible to decide for you, it's like deciding that PS II or Elements is the best for you(it could be the (free) Gimp)
Some years ago, free stitchers were undocumented and had no decent interface. Free (or low cost) well documented stitchers now exist and use sophisticated techniques derived from academic research. Well established expensive stitchers are designed to satisfy their customers needs, this includes not spending too much time to decide which one is the best for them!
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Forum:
Q & A
Thread:
Lens sizes?
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Re: PhotoBill
Posted: 28 Nov 2005 at 17:23 GMT
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I have assembled several times 55 portrait oriented shots taken using a 150 mm equivalent for a 360° result. I have shot and assembled large series using a 300 mm equivalent but actually never assembled any 110 vertical shots series to reach 360°.
 Apologies!
This is feasible using cylindrical projection mode, assembling first several 90° or 120° parts which share an image at each end and then assembling the final pano using PS, but as the final result is wider than 30,000 pixels, Photoshop PSB file format is mandatory and the result rather difficult to show!
In case you are patient enough, here is an example of those "skyline panos" (reduced to 13000 x 440):
slash72.club.fr/gurl/vuedensemble/vuedensemble.ht...
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Forum:
Q & A
Thread:
Lens sizes?
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Re: Lens sizes?
Posted: 21 Nov 2005 at 1:25 GMT
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For 360° panos of landscapes or other static subjects, the answer is yes. Though this is not usual, I have made 360° landscape panos using a 300 mm lens equivalent!
On the contrary, if you want to make 360° x 180° (where zenith and nadir are included) of moving subjects, a 35 mm lens is not enough: a total coverage of the sphere would need no less than 80 shots... for this kind of panos, the wider the lens the better (this includes fisheyes.)
Anyways, you should begin shooting panos with your present camera (with or without a tripod, with or without a pano-head, this depends on your preferred subjects and the stitcher you select.) Any panorama experience will be an invaluable help in selecting a future camera and lenses.
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Forum:
Q & A
Thread:
How would you create a panoramic photo along forty blocks of Fifth Avenue?
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Forum:
Q & A
Thread:
How would you create a panoramic photo along forty blocks of Fifth Avenue?
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Forum:
Tips & Tricks
Thread:
Multirow pano tutorials?
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Forum:
Q & A
Thread:
defish for Realviz
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Forum:
Q & A
Thread:
Please Help! PTGui 5.4
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An answer to point 2)
Posted: 31 Oct 2005 at 19:15 GMT
updated: 31 Oct 2005 at 19:19 GMT
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If you stitch your images row after row first, you will not be able to get a good final stitch of the intermediate rows using any of the available projection modes (rectilinear/flat, cylindrical and equirectangular/spherical). Perspective in the top and bottom rows would not match...
If you stitch your images column after column first and do not use rectilinear projection (but the cylindrical or equirectangular one) the final result you will get when stitching all the columns together could be an excellent one.
Here is a discution about doing that on Max Lyons forum: www.tawbaware.com/forum2/viewtopic.php?t=826&high... (under the name Big mosaics on small computers.)
 Besides that, it's a terrible idea to begin using PTgui (or any other stitcher) for a 200 images project!
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Forum:
Galleries
Thread:
virtual tour of a car
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Forum:
Galleries
Thread:
Prague 360
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Re: Prague 360
Posted: 30 Oct 2005 at 17:59 GMT
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Without comments, I feel like a tourist, completely lost in a place I know nothing about but the names. Where comments exist, I feel like being with a friend who knows the place and that's much better.
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Forum:
Q & A
Thread:
I want to defish 10.5mm images, but dont have a mac
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Re: many tools available!
Posted: 30 Oct 2005 at 10:30 GMT
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PTLens plugin help is in the PTLensPlugInHelp.pdf file included in the plugin zip.
The main advantage of using PTLens plugin to defish a fisheye image (besides the fact that it includes vignetting and chromatic aberrations corrections) is that you can adjust the amount of defishing. I often use "intermediate defishing" (resulting image is not a "full-rectilinear" one) because I prefer such result. (Your mileage may vary!)
Following an inescapable math law, full circular 180° (or larger than 180°) fisheye image can't give a "fully defished" rectilinear image: if you try to do that using PTLens, what you get is a grey pixel surrounded by many black ones: this is not a program fault but a decent approximation of the infinite resulting image this would make!
You can use other Panotools front-ends (Hugin, PTAssembler, PTgui) to defish + adjust the prespective. I use PTAssembler for that: moving the PTA "Reference Point" to the left or the right and/or up and down results in various perspective corrections: just select the one you prefer.
What I often do is to make a 360°x180° equirectangular version of full-framme fisheye images (where full-frame means diagonal = 180°). Though a large part of the result is black, I can navigate this result using a viewer: I believe the best viewer for that is FieldOfVision SPi-V because one can just drag the JPEG onto its icon and wait a few seconds before getting the view (no cube is needed).
Another interesting viewer is Mind-Eyes-Viewer (it can be found on the Pictosphere site). Using it, you can make plane projection of an entire sphere (I don't know the name of such a projection, perhaps it's hyperbolic?), or (using its "Picto" button) view a spherical version you can rotate using the mouse! Here is a post about that on Max Lyons website: www.tawbaware.com/forum2/viewtopic.php?t=2756
Fisheye + projection tools + perspective tools = another photographic world to explore (...but you should not hope many applauses when showing your images.)
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