I got an answer to my problem using Gimp. That was: 
Use GEGLs panorama-projection operation, which you can find under /Filters/Map/Panorama Projection.

Does anyone know how to install the panorama projection operation? My websearch was fruitless!

On Sat, Nov 3, 2018 at 8:58 PM Brian Cluff <brian@snaptek.com> wrote:
It will still work with only 1 image.  If hugin knows what kind of image it is and how many degrees of view it is it will know, at least roughly, how to warp the image to make it flat.
It actually has to know how to do that so that it can prepare images so that they can be stitched together. Otherwise they wouldn't line up correctly... usually with them being pinched slightly at the sides top and bottom.

Brian Cluff

On 11/3/18 5:02 PM, Michael wrote:
well.... it sounded like a good idea but the image is only one.]

On Sat, Nov 3, 2018 at 7:31 PM Michael <bmike1@gmail.com> wrote:
THANKS! I should have thought of that.

On Sat, Nov 3, 2018 at 7:15 PM Brian Cluff <brian@snaptek.com> wrote:
You should be able to load the image into Hugin and with the correct settings be able to extract a rectilinear image.  If the image contains the correct lens information it will probably just work.

Brian Cluff

On 11/3/18 10:01 AM, Michael wrote:
I want to be able to take portions of that image and display them as if it was taken with a standard camera. anyone know how to do it>?


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