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I did not know where to ask, I will try it here. I work in a local planetarium and I wonder if it is possible to edit an image in such way, that when projected on spherical cupola (diameter 8 m), it would not look too much distorted. Is there any easy way to edit an image this way?

Petr Hykš
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    Figure out how the image is mapped to the sphere (you can test with an image of a grid) and then work backwards – ratchet freak May 28 '19 at 10:36
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    It doesn't sound dissimilar to the problem of coping with the distortions needed when rendering for VR glasses, e.g. barrel/pincushion https://www.imgtec.com/blog/speeding-up-gpu-barrel-distortion-correction-in-mobile-vr/ – Simon F May 28 '19 at 13:09
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    Check out the projections used for maps (globe vs planar): https://en.m.wikipedia.org/wiki/Map_projection Then choose the one that preserves the properties that you want (area, angles...) – lightxbulb May 28 '19 at 17:58

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