kasenyee
Posts: 73
Location: Toronto, Canada
Registered: 22 Jun 2012
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Crooked Pano
Posted: 22 Nov 2012 at 3:01 GMT
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Hey all
I've recently shot a tour, and since it was a real rush job, i didn't level the tripod properly and most of my panos are now slanted. What's the easiest way to fix this?
I'm just looking to almost rotate the whole thing a couple of degrees to the right or left - depending on the pan.
Thanks
Alex
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Smooth
Posts: 4013
Location: Mount Panorama, Australia
Registered: 21 Jul 2004
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Re: Crooked Pano
Posted: 22 Nov 2012 at 3:12 GMT
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Open your PTGui project and add T1 vertical control points.
Go to the Control Points (tab)
Start with image 0 in the left pane and also in the right pane.
Select T1 control point and add the control point to a vertical line in your image at the top. (Say a door frame, window frame) Something you know was built vertical.
When the control point jumps to the right pane, drag the control point to a lower position on the same vertical object.
Repeat on other images. Two to three vertical lines across the panoramic scene.
Once done. go to the panorama editor and from the menu select Edit>Level Panorama
By adding the T1 control points you are telling PTGui what is Vertical.
Regards, Smooth 
www.omnipix.com.au
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kasenyee
Posts: 73
Location: Toronto, Canada
Registered: 22 Jun 2012
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Re: Crooked Pano
Posted: 22 Nov 2012 at 3:53 GMT
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how many times would you suggest? it's in HDR, with 3 brackets total, do i need to do it for every exposure? I linked the images with HDR Tone Mapping.
Thanks!
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Smooth
Posts: 4013
Location: Mount Panorama, Australia
Registered: 21 Jul 2004
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Re: Crooked Pano
Posted: 22 Nov 2012 at 4:00 GMT
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I would think three images over one set. You do not need to do the bracketed sets if they are linked. Just make sure the vertical lines are spread from one side of the panorama to the next. Say a left, centre and right vertical line across the panoramic scene.
Test it, only takes a few minutes tops!
Regards, Smooth
www.omnipix.com.au
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kasenyee
Posts: 73
Location: Toronto, Canada
Registered: 22 Jun 2012
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Re: Crooked Pano
Posted: 22 Nov 2012 at 4:02 GMT
updated: 22 Nov 2012 at 4:15 GMT
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I think i'm missing something. Am i adding T1 Vertical CP so it lines up with an image to the left or right? Because with 25% overlap, how can i do it in the middle left and right sides of the image?
what about horizontal T2 CP?are they the same or is that for a different purpose?
thanks
alex
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Smooth
Posts: 4013
Location: Mount Panorama, Australia
Registered: 21 Jul 2004
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Re: Crooked Pano
Posted: 22 Nov 2012 at 4:32 GMT
updated: 22 Nov 2012 at 4:36 GMT
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As I stated, use the same image in both panes.
Control point high on a vertical line on the left and control point low on the same vertical line in the right pane (same image).
One pair of control points per image.
Three vertical control points across the whole panoramic scene. Left of scene, Centre of scene and right of scene (if possible). If for instance you shot 6 around every second image would get a vertical control point. Say images 0, 2, 4 and 6 or 1, 3, 5. Not a rule, simply a guide.
You will not need to use T2 control points generally.
Regards, Smooth
www.omnipix.com.au
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Smooth
Posts: 4013
Location: Mount Panorama, Australia
Registered: 21 Jul 2004
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Re: Crooked Pano
Posted: 22 Nov 2012 at 7:49 GMT
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I should also mention you can straighten up an already stitched panorama.
Import the panorama (when the lens parameters window shows up hit cancel), go to the Panorama Settings tab (advance mode) and adjust the parameters I.E: Equirectangular for Spherical panorama FOV: 360x180
Now head to the Control Points (tab) and assign a few T1 vertical control points. Then go to the Panorama Editor and Edit> Level Panorama
Once leveled, publish your straightened panorama.
Regards, Smooth
www.omnipix.com.au
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John Houghton
Posts: 3710
Location: Hitchin, United Kingdom
Registered: 17 Jan 2005
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Re: Crooked Pano
Posted: 22 Nov 2012 at 18:09 GMT
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kasenyee said: what about horizontal T2 CP?are they the same or is that for a different purpose?
Only the straight line of the natural horizon is (or should be) rendered straight in an equirectangular panorama. All other horizontal straight edges become curved. So you can use t2 points when the horizon is in view at the seaside, for example, where there might also be a shortage of vertical features. Note that features reflected in still water such as a lake are good candidates for t1 points, as the feature and its reflection are naturally vertically aligned.
John
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