I asked about this once before without too much luck. Let me try again. I need to correct distortion from my 18-200 mm lens for my Nikon D80.
I can experiment with the controls until I get what looks reasonable, but it would be easier if I could find recommendations for settings of the lens distortion filter at different focal lengths for the lens. I used to use a Panorama Tools plugin for gimp for which I found such recommendations, but I can't get that plugin to work with recent versions of gimp. Of course I can experiment by photographing a grid at different focal lengths and different subject distances and using trial and error, and create myh own tables. But, I hope someone has already done that. Finally, where can I find a description of the the algorithm that the filter uses. If I had that, it might simplify things. Usually these algorithms apply a polynomial (usually cubic) correction based on the radial distance from the center of the image. The parameters set the coefficients of the polynomial. -- Leonard Evens l...@math.northwestern.edu Professor Emeritus, Department of Mathematics, Northwestern University _______________________________________________ Gimp-user mailing list Gimp-user@lists.XCF.Berkeley.EDU https://lists.XCF.Berkeley.EDU/mailman/listinfo/gimp-user
