I think you misunderstand. This has nothing to do with "art".
My optical system has a significant problem with astigmatism in just one corner. Its at a remote site in another country so it is uneconomical at this stage to retrieve it for possible repair. (Expensive down time)
I just wondered if anyone has written an easy to use analysis / correction program that was available to apply a warp correction given that there are a number of papers in the scientific literature dealing with the very problem of lens defect correction (largely for high end photo stitching). The interesting thing is the methods need a calibration target to be imaged to characterise the lens fault before a warp map can be created. For astrophotography the calibration target will be the stars in the image - we known these should be round so we can go from here re shape distortion. Also position distortion can be correlated via plate solving star databases.
If no one has done this specifically for AP then I'll have a go as I worked with image processing algorithms when I worked as a developer at a university based company - just not yet sure how difficult it will be. The easiest problem to identify and fix would be CCD chip non orthogonality .. the rest is hard.
Edited by Tonk, 16 April 2019 - 07:01 AM.