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Date: Mon, 5 Nov 2012 05:20:17 -0800 (PST)
From: AlanWB <a.j.wh...@blueyonder.co.uk>
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Subject: Re: PTGui 9.1.3 Fails to Level Horizon
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John,

Many thanks to you, Erik, Mathew, et al. Success! 

I have tried the various techniques you suggested and I am now confident 
that I can fix saggy horizons in future. (And avoid the pitfalls in the 
field that make it difficult.) 

Alan W

On Monday, 5 November 2012 08:45:25 UTC, John Houghton wrote:
>
> On Nov 4, 9:14 pm, AlanWB <a.j.wh...@blueyonder.co.uk> wrote: 
> > Erik, 
> > 
> > Thanks for the advice about parallax. 
> > 
> > I tried to repeat your procedure, but I still got a saggy panorama. 
>
> Mostly doing the same as Erik, I levelled the panorama with horizontal 
> line control points.  I also deleted image 1, which is more-or-less 
> identical to image 0. I have uploaded my project file and stitched 
> image at: 
>
> http://www.ge.tt/5YbEbxQ/v/0?c 
>
> Panorama blending is compromised by variations in exposure and white 
> balance, and also by the effects of parallax.  Auto exposure and white 
> balance camera settings should be avoided, and as already mentioned, a 
> panorama head is also recommended.  I output a PSD layered file and 
> after some manual image adjustements used the auto blend option in 
> Photoshop for the result included in my upload. 
>
> John 
>

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John,<br><br>Many thanks to you, Erik, Mathew, et al. Success! <br><br>I have tried the various techniques you suggested and I am now confident that I can fix saggy horizons in future. (And avoid the pitfalls in the field that make it difficult.) <br><br>Alan W<br><br>On Monday, 5 November 2012 08:45:25 UTC, John Houghton  wrote:<blockquote class="gmail_quote" style="margin: 0;margin-left: 0.8ex;border-left: 1px #ccc solid;padding-left: 1ex;">On Nov 4, 9:14&nbsp;pm, AlanWB &lt;<a>a.j.wh...@blueyonder.co.uk</a>&gt; wrote:
<br>&gt; Erik,
<br>&gt;
<br>&gt; Thanks for the advice about parallax.
<br>&gt;
<br>&gt; I tried to repeat your procedure, but I still got a saggy panorama.
<br>
<br>Mostly doing the same as Erik, I levelled the panorama with horizontal
<br>line control points. &nbsp;I also deleted image 1, which is more-or-less
<br>identical to image 0. I have uploaded my project file and stitched
<br>image at:
<br>
<br><a href="http://www.ge.tt/5YbEbxQ/v/0?c" target="_blank">http://www.ge.tt/5YbEbxQ/v/0?c</a>
<br>
<br>Panorama blending is compromised by variations in exposure and white
<br>balance, and also by the effects of parallax. &nbsp;Auto exposure and white
<br>balance camera settings should be avoided, and as already mentioned, a
<br>panorama head is also recommended. &nbsp;I output a PSD layered file and
<br>after some manual image adjustements used the auto blend option in
<br>Photoshop for the result included in my upload.
<br>
<br>John
<br></blockquote>
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