I have no idea what the rules are either but I would simply clone out
the boats(s) that you don't want showing.
Chuck Norcutt
Frank van Lindert wrote:
> Recently I enjoyed a day out in Amsterdam, including a boat trip
> through the canals and harbour and a cocktail party on the top floor
> one of the old warehouses (Veem) situated on a harbour quay. Very nice
> indeed.
>
> I shot many pictures there, including a series of seven from a window
> of that warehouse/pub of which I stitched a panorama. It is a view to
> the northeast over the IJ, the river splitting Amsterdam in the main
> southern and smaller northern part.
>
> I did this in PS, but some strange things happened. I had not noticed
> that there was a distant but fast sailing passenger ferry in the
> pictures, which was in a separate position in four of the seven shots.
> In the resulting panorama I saw two instances of that vessel. When I
> changed some of the options even four showed up!
>
> Here is a low res copy of the one showing the same yellow-green ferry
> twice, once almost in the centre of the picture and the second a few
> hundred yards to the right:
> http://tinyurl.com/o6rgs3
>
> I then reverted to PTGui, which is more difficult to handle. But
> things improved: the result showed only one instance of the ferry
> boat. It must have recognized the multiple vessels as identical, and
> have rejected all but one, although I have no idea how this is done
> and how the choice is made. The boat position is now more to the left
> - i.e. from an earlier shot - than the two boats in the PS pano:
> http://tinyurl.com/rcv25r
>
> Now my questions.
> What is causing this odd behaviour in Photoshop? And can it be
> avoided? Not that I often make panoramas of fast moving objects, but
> it would be nice to know anyway.
>
> In PTGui, would it be possible for the user to choose one picture of
> the series to determine the position of a moving object (like my boat)
> in the final panorama, rather than letting PTGui make the choice?
>
> BTW, the pictures have been made with an Oly SP 590 UZ.
>
>
> Frank van Lindert
> Utrecht NL.
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