panorama software,virtual tour software
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Joined: 2005-09-16
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2005-09-27
#1

Pano Problem

Can anyone tell me why, when I assemble my panos in TW they all have a very marked jagged effect on diagonal edges. By this I mean as the viewer pans round any diagonals appear as a series of offset straight lines (if that makes sense). There is a terrible shimmering of all edges when panning.

I have checked out other members panos which are alot better than mine using similar setup (I have 350d, sigma 8mm, MTCPS). I have stitched using PW and PTgui both of which appear very well stitched and clear as a still pano.

I assume its something to do with image size but cant figure it out.

Many thanks for any help.

 


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Joined: 2004-12-16
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2005-09-27
#2
Hi Crafty

My panos in the TW are ca. 200 k filesize each and 1500 x 750 px.

What about yours? Do you have a link to your panos?

regards, Markus
http://www.powertext.ch Canon 20D / Sigma 8mm / Roundshot VR-Drive
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2005-09-27
#3

My Panos are ca. 800K and 3000x1500px. Even at bigger file sizes they dont appear as good as yours Markus.

Sorry I dont have a website yet.

Do the images appear better when viewed on a web page ie is the TW Preview a low resolution sample? Would they be better when published to a website?

 

Many thanks.


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2005-09-27
#4
Your size is way too high. go down to the size I mentioned and it will be ok.

No, TW displays the panos in the preview as they appear in the web.
http://www.powertext.ch Canon 20D / Sigma 8mm / Roundshot VR-Drive
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2005-09-27
#5

Thanks Markus

Thats certainly better. Is this the optimum size?

Why do they appear better at lower res?

Thanks again


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2005-09-27
#6

All digital images will appear better when they are at a resolution that's equal to the screen resolution. If your image is too big, then it will be resized. The interpolation method that is chosen will affect the image quality.

I am not all that familiar with how panos are resized (is it done in TW or does the browser do it? I don't know), but the principle is the same. Your monitor is only capable of displaying at 72dpi. Large images have more information (pixels) than the monitor can display and many pixels will be disregarded. On the other hand, if an image is smaller than the viewable size, then pixels will be duplicated, which also negatively affects the image quality.

I'm not sure what it is, but there's probably an ideal size (pixel dimensions not actual file size) depending on the intended viewable size (a small window vs. full-screen).


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2005-09-27
#7

Thanks so does anyone know what the optimum size is for say a 400x300 screen?

Finally I need to get photoshop but cant afford the full cs version. Does anyone know if PS Elements will do mirrorball extension and other necessary functions etc.

Thanks to all for your patience.


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2005-09-27
#8

For a 400 x 300 viewer I would suggest 1400 x 700 or 1500 x 750.

These settings a proved and tested by many users over a long period of time.

Regards, Smooth


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2005-09-28
#9

Sorry to bring this back up but Istill have problems with diagonalsand edges, even when viewing the flat pano jpeg image. (If its bad on the jpeg then it will of course be bad when viewed spherical) Diagonal lines appear jagged and illdefined. I think the problem comes down to basic photography in the first place maybe

I am using 350d on Hi res (8Mp), aperture priority f8, man focus infinity, man white bal - everything Ive read about but no where near as good as yours Markus (and smooth)

 

Any ideas please


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2005-09-28
#10
Is there anyway you can post the image in question? Does it look good high-res straight out of the camera? Doe it go bad when resizing it down?
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2005-09-28
#11

Yes, the image goes bad when sizing down. The images from the camera are razor sharp.

Well in the hope someone can spot my mistakes heres a rundown of my method:

Import 4 shots from 350d + sigma 8mm at max res 8Mp into ptgui5

Each shot is approx.2300x3450

Select full frame 180 degrees, panorama settimgs 360x180

Generate control points usually spot on automatically

In create Panorama tab image defaults to approx 2800x1400ish and use smartblend plug in

This creates a jpeg image 2800x1400 file size 750Kb.

This seems to be where it all goes wrong as this image already has jagged diagonals etc.

Putting into TW or QT obviously shows this error

Any ideas..please........(pulls out last remaining hair)!!

 

Thanks again