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Wouldn't astrophotography be done using lossless (or no) compression?

• kergonath 6y ago
  It depends. Cheap webcams are commonly used for planets, for example. They record a bunch of JPEGs or a movie, which are then processed and stacked. The idea is that with many exposures you get as much signal as with a long one, without the associated artefacts (noise from high sensitivity, blur from fluctuations in the atmosphere, etc). Compression artefacts don’t matter as much, but sensor noise does. Of course, in some cases shooting RAW from a specialised camera is better, but quite often JPEGs straight out of a standard (cheap DSLR or mirrorless, or webcam) camera are more than enough. Takes an order of magnitude less memory as well, which counts when you have stacks with 200 pictures. There is a discussion here, for example: https://www.planetguide.net/astrophotography-webcam/ https://www.planetguide.net/astrophotography-webcam/