Cropping a panorama in PTGui Pro

[Darek]

Hi guys.

I would appreciate if someone could tell me what is happening here and why. I have made a panorama: 6 shots around and 1 for the Zenith. I aligned the images and got the panorama preview in the Panorama Editor. I don't have a Nadir shot so obviously there is an empty space. Anyway I generated a preview. The 360 panorama looked good. All the horizontal lines were straight (see the screenshot below).

Now I went back to the Panorama Editor to crop the panorama and get rid of the empty space at the bottom (see the screenshot below - the preview is washed out because it is an HDR preview). I used the manual crop.

Then I generated another 360 panorama preview and all the horizontal lines at the top (where walls and ceiling meet) are bent now (see the screenshot below).

What is happening and how can it be corrected? For most of my panoramas I don't need to take the Nadir shot.

 

I wanted to try to troubleshoot this problem myself. I needed more clues. I have a trial version of Autopano Giga from Kolor. It has a very nice feature called Crop that auto crops the panorama. I generated one cropped panorama using Autopano Giga and one cropped panorama using PTGui Pro. I opened them both in Panotour Pro from Kolor. In the generated 360 preview the panorama created with Autopano was fine (lines were straight) but the panorama created with PTGui Pro was wrong (the lines were bent). So what I did, I checked the properties of these two panoramas (in Panotour) and I found out that the panorama generated with Autopano had a Vertical Offset applied and the panorama generated with PTGui Pro did not. When I manually applied the same offset to the PTGui panorama (in Panotour) the 360 preview looked just fine.

 

To add more to this story I have made the same test with Tourweaver from Easypano. I loaded both panoramas (Autopano Giga and PTGui Pro). I tested them in the 360 preview and both had the curved lines. It looks like the panorama generated with Autopano Giga has the information about the Vertical Offset written either in the EXIF part of the file or somehow embeded in the file so Panotour Pro can read it and apply it. I also tested it with Pano2VR. The lines in both panoramas were curved.

 

Thank you for reading this post and I hope that someone will point to the right direction.

 

Cheers

[Willy Kaemena GM]

The clue is: You have to maintain the 1:2 proportion of the  360 full spherical pano !!!!

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[Darek]

Hi Willy,

Maybe I was not clear enough. I am not looking for a full spherical pano. Obviously for that I would need a Nadir shot. I know. I need a pano with a limited FOV (where Nadir is) but adjusted so the horizontal lines keep straight. Any other clues? As I mentioned in my post it was possible to maintain straight lines with Panotour Pro from Kolor so it can be done. Thing is I would like to use PTGui Pro for stitching panos and Tourweaver to make tours.

Cheers,

[Keith Martin]

On 12 Mar 2013, at 23:09, Darek <darek.st...@gmail.com> wrote:

I need a pano with a limited FOV (where Nadir is) but adjusted so the horizontal lines keep straight.

And that's the trick. Either you use a cropped, non-equirectangular panorama image with an application that is designed to work with non-spherical input (so the projection is designed to work with that), or you use the full 360x180-degree equirectangular image and use an application that's able to limit how far down someone cal look so they can't actually see the plain nadir space.

I'm afraid I can't help there – well, not beyond saying I seem to remember that Pano2VR can do both. I always make full spherical panos so I've no recent experience of the kind of thing you're trying to do.

One other thing... this is from the boilerplate text tagged onto each email sent through here:

Please do not add attachments to your posts; instead upload your files at a file sharing site (for example http://ge.tt/ ) and include a link in your message.

It's best if you don't put image attachments into your posts. Remember, this is a mailing list, not a web forum! :)

k

[Darek]

Hi thatkeith,

 

I think you gave me the clue I was looking for. I don't need to crop the panorama itself. Duh!!! Like you said, I can control the FOV of a panorama when putting a tour together. This is where I can (I think) cantrol how faw down a viewer can see. I forgot. Am I right here? This should work just fine. Thank you.

 

As of the attached pictures, I am sorry. I am new here and was not realizing that this could be an issue.

 

Cheers,

[Geoff - Spherical Visions]

The inbuilt "Publish to Web Site" function under Tools allows you to limit the angle of the viewer so no need for any other program.

[Keith Martin]

On 12 Mar 2013, at 23:52, Darek <darek.st...@gmail.com> wrote:

> Like you said, I can control the FOV of a panorama when putting a tour together.

Exactly! Different applications will take slightly different routes to this, but that's what to look for. Glad I could help indicate a useful direction.


> As of the attached pictures [...]

No sweat! It's not as much of an issue as it was some years back, but it's definitely one of those etiquette things in mailing lists. We live and learn. :)

k

[Darek]

I want to thank you all for sharing your thoughts and all the direction you gave me.

Cheers,