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Graham,
I would say that the complexity of working out exactly the correct process for getting the originals back might be more time consuming than reimaging.
This would however be a good exercise for a student of astrophotography to fully understand the process (as MaxIm does it) by reversing each step of the process in the correct order.
From what you have indicated there are quite a few steps in this process.
I dont think its impossible and probably well worth the mental exercise if you have plenty of time to waste ! - but not easy either.
Its been too long for me to recall what and how MaxIm does it - a lot depends on what you have in the directory and if MaxIm has automatically scaled the darks or not !
A lot of unknowns, how the pedestal was treated, what algorithm MaxIm used on the flats etc
If you got it sorted out - assuming the images are the same temp and same exposure time and all used the same Darks, Bias and Flats . . . a lot of "Ifs", then you could write one Pixel Maths formula and execute this on each image at a time - being careful to rename the original to the same name used in the formula and then rename the new image appropriately.
That need not necessarily be done in MaxIm by the way - you could use PI (assuming you inform PI of the appropriate file types)
What we need is the ISS CIS team to do the forensics for you !
Good luck with it - Who's game ?
Cheers
Rally
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