While doing experiments with Pano2VR I discovered that the last Mac version defaults to Pi conversion of cubefaces in the convert input option but when you do...
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erik leeman
erik_leeman
Nov 1, 2008 10:35 am
What version did you use? v2.1.1 or v2.2 beta1? According to Thomas there are some bugs in 2.2 beta1 that will be dealt with in the forthcoming beta2. Erik...
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philipp_koch_als_name...
philipp_koch...
Nov 1, 2008 11:33 am
Hans, thanks for your efforts to share your findings with us! Hhm, but I must admit I'm not sure if I do understand this correctly. Do you mean it's possible...
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Erik Krause
ekrause2003
Nov 1, 2008 12:17 pm
... Nice test. However, we all know that using a large cube face size and not allowing zoom in to 1:1 pixel display is a waste of bandwidth. It is no surprise...
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Erik Krause
ekrause2003
Nov 1, 2008 12:17 pm
... Go to Tools -> Options -> Folders&Files and look what is configured for Equierctangular JPEG. Enter your favorite viewer if necessary. best regards -- Erik...
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Erik Krause
ekrause2003
Nov 1, 2008 12:17 pm
... This may be due to the fact that Pano2VR uses a non-sharpening anti- aliasing interpolator. On http://wiki.panotools.org/Anti-aliasing_interpolators the...
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Hans Nyberg
panoramicsdk
Nov 1, 2008 12:38 pm
... Yes and No. You may also do that But If you read my page again you will see that I use the full resolution equirectangular as the source image to convert...
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Philipp B. Koch
philipp_koch...
Nov 1, 2008 12:53 pm
... Ah, ok. So in the example given above one would take the 1000 x 500 equirectangular and convert it directly to cube faces with 222 x 222... ... I'm always...
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crane@...
m_c_r_a_n_e
Nov 1, 2008 12:56 pm
... http://www.panagito.com/MISC/cat.html for glass bottom lighting is nice. so I made a hole in a piece of transluscent plastic and a disc that fitted the...
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Hans Nyberg
panoramicsdk
Nov 1, 2008 1:17 pm
... CubicConverter uses Bicubic which seems to be called Cubic in wiki. Why not use the Bicubic definition if it is the same. I never heard anyone call it just...
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Erik Krause
ekrause2003
Nov 1, 2008 1:52 pm
Am Saturday, November 01, 2008 um 11:33 schrieb ... No. To simplify the calculation you can simply divide by 4.5 (app. pi/0.7) In any case: It might be best to...
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Hans Nyberg
panoramicsdk
Nov 1, 2008 2:02 pm
... An image says more than..... Here is a screenshot with movies made from the 8600x4300 test image. Resized to 1904 cubefaces directly. From left Pano2VR...
24219
Philipp B. Koch
philipp_koch...
Nov 1, 2008 2:03 pm
... Thanks a lot, that really simple :-) ... I'm using Eric Gerds' DOSUP (Pano2Faces.bat) for conversion. As far as I know it's using spline64 as interpolator....
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Erik Krause
ekrause2003
Nov 1, 2008 2:21 pm
... I don't know whether it is really the same. However, apparently the algorithm was called cubic in the originating paper: ...
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Sacha Griffin
sachagriffin
Nov 1, 2008 2:59 pm
I think this proves an important point. You can't simply throw away pixels hoping they are bayer artifacts. The top left is so terrible compared to the others....
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Keith Martin
the1keith
Nov 1, 2008 3:16 pm
... Exactly, and well pointed out! This is an interesting trade-off that's worth remembering. With very high resolution images, JPEG damage isn't as noticable...
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Ken Warner
kwarner000@...
Nov 1, 2008 3:35 pm
Yes, it was using QT as the viewer. I also had RealPlayer configured as my default player for .mov files. I think the combination was the cause. Fixed it --...
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Szymon "Zbooy&qu...
zbujcio
Nov 1, 2008 4:16 pm
It's another All Saints' Day here in Poland, the time to visit cemeteries and light some candles on the graves. The weather's not too conducive to photo ...
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Erik Krause
ekrause2003
Nov 1, 2008 4:36 pm
... spline64 isn't an anti-aliasing interpolator hence it's not optimal for downsizing. You can specify different interpolators on the DOSUP command line, but...
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Philipp B. Koch
philipp_koch...
Nov 1, 2008 4:54 pm
Thanks a lot, Erik! I've tried both Lanczos3 and Mitchell with DOSUP like you proposed. The visual difference is surely worth the (much) longer processing time...
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Thomas Rauscher
wuuuz_144
Nov 1, 2008 5:10 pm
... This is chosen by design, and there are two reason: * The tile size width/Pi is practical for converting between formats to avoid losing quality but for...
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Thomas Rauscher
wuuuz_144
Nov 1, 2008 5:35 pm
... The "bi" in bicubic comes from the fact that the filter is used 2 times, one time in X and one time in Y direction. If you use such a filter on a CT scan...
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Thomas Rauscher
wuuuz_144
Nov 1, 2008 5:52 pm
... The reason for these artifacts is chroma subsampling http://en.wikipedia.org/wiki/Chroma_subsampling . In Pano2VR and Pano2QTVR the subsampling is turned...
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fierodeval
Nov 1, 2008 6:04 pm
Hi Thomas, I saw this behavior too, if I open a 4000x2000 panorama, then the default cubeface is width/4 = 1000. But if you use width/4 you are loosing quality...
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Hans Nyberg
panoramicsdk
Nov 1, 2008 6:19 pm
... to Pi ... the ... Ok If you had followed this thread this is exactly what I have tried to illustrate. However I still believe the different sizes are...
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Hans Nyberg
panoramicsdk
Nov 1, 2008 6:24 pm
... I agree completelly. The optimal size shown right beside the cubface size is very confusing. It is also not relevant today. You do not produce movies for...
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Thomas Rauscher
wuuuz_144
Nov 1, 2008 7:39 pm
... But for the "best cube face possible" you have to think the other direction. You have to think of the necessary equirectangular to produce these cube...
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Erik Krause
ekrause2003
Nov 1, 2008 8:27 pm
Hello, I removed 10 members with long time bouncing email address. The PanotoolsNG User Guidelines require you to use a valid email address. See...
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Erik Krause
ekrause2003
Nov 1, 2008 8:59 pm
... How much do you downsample? I did some tests some time ago and found no big difference for a 4000x2000 to cubefaces 1200 remapping tasks. ->...
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fierodeval
Nov 1, 2008 9:00 pm
Yes, I understand. But when you speak about the "sqrt(2)", you are speaking about the figure in the right of this image ...
