Page 1 of 1

Filesize vs. image quality ?

Posted: Sat Mar 12, 2011 10:59 pm
by pano360
Hey !

Great to see the forum is back.

I haven't been playing with panoramas for quite some time now and I was wondering what's the norm for good quality, full screen panos these days ?

How much is enough ? 8000x4000 equi > downsampled to 1300 px cubefaces like I used to do ? Would it be ok ? What JPG quality do you use? How many MB ?

Thanks,
J.

Re: Filesize vs. image quality ?

Posted: Sat Mar 12, 2011 11:52 pm
by VRwave
Welcome back, J. !

I would say using 1900x1900 px cubefaces is good enough (this is about 6000x3000 in equirectangular projection) and using 70-75 JPG compression should produce 2.5 - 3 MB panos, or less, provided your panos are noise free (low ISO, good RAW/NEF processing, proper sharpening).

But if you want to be future proof you could use a multi-resolution Flash panorama player, like krpano and display your full resolution original image.

I hope this answers your question.

Converting from equirectangular to cubic faces

Posted: Sun Mar 13, 2011 2:34 pm
by Milos
How do you make the conversion from equirectangular to cubic faces ... you just divide it by Pi (3.14) ?

6000/Pi=1910 pixels

Re: Converting from equirectangular to cubic faces

Posted: Sun Mar 13, 2011 2:45 pm
by VRwave
Milos wrote:How do you make the conversion from equirectangular to cubic faces ... you just divide it by Pi (3.14) ?


Yes, this is how Pano2QTVR does it.

Re: Filesize vs. image quality ?

Posted: Mon Mar 14, 2011 2:20 pm
by omnipix
When using Pano2VR (the successor to Pano2QTVR) and it's multi-resolution options I have found that a native starting tile of 1624px fits my needs when comparing image quality vs file size for fullscreen display.

I actually make the 1624px cubes the embedded tiles of the standalone .swf file and all higher resolution tiles are called in stages of zooming from a separate external directory. My next jump is 2320px cubes and these are called after minimal zoom if the person finds the scene interesting enough. Of course by doing this, only the tiles required of the panorama "in view, on screen" are downloaded reducing bandwidth for both parties. Basically if you don't zoom the higher resolution tiles are never called. My tiles are 464px each regardless of resolution and I keep all cube faces divisible by this figure, meaning every tile is a perfect 1:1 464px square.

Regards, Smooth 8-)

Re: Filesize vs. image quality ?

Posted: Tue Mar 15, 2011 1:35 pm
by pano360
Thanks guys

Looks like I'll be getting one of the multi-resolution players. It's either Pano2VR or KRpano, what do you recommend ?

omnipix wrote:I actually make the 1624px cubes the embedded tiles of the standalone .swf file ... My next jump is 2320px cubes ... My tiles are 464px each regardless of resolution and I keep all cube faces divisible by this figure, meaning every tile is a perfect 1:1 464px square.

Smooth, great info, man ! I'll try to remember to use those sizes.

Re: Filesize vs. image quality ?

Posted: Tue Mar 15, 2011 2:46 pm
by omnipix
pano360 wrote:Looks like I'll be getting one of the multi-resolution players. It's either Pano2VR or KRpano, what do you recommend ?

Well, I use Pano2VR but it is obvious that KRP is the superior pano player as far as programmable coded features are concerned (if you require them). That said, just about everybody owns a Pano2VR license because the program offers serious tools that just about everyone needs in one way or another regardless of the final player they choose to project with.

Pano2VR suits me and has a long history, constant improvements and a GUI. KRP is well respected by some serious panographers also, but lacks the GUI.

Test both and see what you like.

Regards, Smooth 8-)

Re: Filesize vs. image quality ?

Posted: Wed Mar 16, 2011 2:09 pm
by pano360
omnipix wrote:Test both and see what you like.

Thanks Smooth, I'll give them a go.

Re: Filesize vs. image quality ?

Posted: Thu Mar 17, 2011 11:23 pm
by Raffi
Multi resolution, the best thing since sliced bread :D

I wonder if there's any way to determine how the users are viewing the tour, how many use the zoom feature and how much they zoom in, if they switch to the full screen display and whatnot.

Re: Filesize vs. image quality ?

Posted: Thu Jan 14, 2016 10:04 am
by Aldowin
final player they choose to project with.
น้ำเต้าปูปลา