I want to do a simple perspective correction which amounts to a yaw

rotation and a vertical displacement, both of which I know pretty

accurately.

I find that I can get the correction I want in the previewer just by

specifying that yaw and vertical displacement.  I don't need any

optimization since there is only one image and there is no barrel or

pincushion distortion to speak of with my large format lenses.   So do I

still use the stitcher somehow to write out the desired transformed

image.



More generally, suppose I just want to apply the relevant projective

transformation, specified as a 3 x 3 matrix?  (I am a retired

mathematics professor who knows how do find such things.)    The

panorama tools plugin for gimp may do it, but as best I can tell, it

doesn't allow for a vertical or horizontal displacements.



--

Leonard Evens <len@...>

Mathematics Department, Northwestern University

On Fri 01-May-2009 at 11:41 -0500, Leonard Evens wrote:



>I find that I can get the correction I want in the previewer just by

>specifying that yaw and vertical displacement.  I don't need any

>optimization since there is only one image and there is no barrel or

>pincushion distortion to speak of with my large format lenses.   So do I

>still use the stitcher somehow to write out the desired transformed

>image.



Yes, you can use the stitcher with just a single photo and you will

get what you see in the Preview window.



--

Bruno