Re: thunder & hailstones


"Dave Liquorice" <new5pam@xxxxxxxxxxx> wrote in message
news:nyyfbegfubjuvyypbz.ink05x0.pminews@xxxxxxxxxxxxxxxxxxx
> On Wed, 28 Sep 2005 19:09:49 +0100, a l l y wrote:
>
>> Here's the stitched version.
>> www.marshallmcgurk.co.uk/stuff/the_side_room/big_rainbow.jpg
>> It is impossible to stitch something like this together accurately,
>> of course, because the camera angle changes with each photo, so I
>> haven't even tried.
>
> But if you mount the camera properly you should be able to. I Think
> the trick is to rotate the camera around the vertical and horizontal
> centre lines of the film plane. Rotation about the vertical centre
> line is how you take panoramas without having to fudge the joins, not
> quite sure what happens if you also rotate about the horizontal.

I think the problem is the same one map-makers have. They are looking down
on to a sphere (the earth) and trying to map this convex shape on a flat
surface. I am *inside* a sphere (the earth's atmosphere) and trying to make
flat images of a concave surface (the sky). You can get away with a simple
panorama where the camera stays at the same height (I've done this several
times fairly successfully) but the minute you start panning upwards as well
as on the horizontal plane things get really complicated. I'm sure there
must be software that'll fix this, but I don't try it often enough to make
it worthwhile.

>
> Still a fascinating image. I think if you played a bit more so the arc
> was perfect both for alignment and sky colours it would be a really go
> image. Take down the houses bottom center so they don't grab the eye
> so much as well.

Yeah, I must play about with it some more. It would be worth the effort for
once.

ally


.

Relevant Pages

  • Re: thunder & hailstones
    ... >> It is impossible to stitch something like this together accurately, ... > But if you mount the camera properly you should be able to. ... > quite sure what happens if you also rotate about the horizontal. ... >> All I've tried to do is get the arc of the rainbow correct, ...
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