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Yes, the original stacked image was made by stacking about 3000 frames, and then saved as a 48 bit TIFF from registax.
When it's loaded into astra-image I use "convert to greyscale" to get back the original 16 bit per pixel resolution image.
(You could save from registax as a 16 bit FITS image, but then you need to use my fixfits utility to make it readable by astra image).
If I'd saved from registax as a BMP (only 8 bits per pixel) then the result would have been a lot worse. It pays off to keep the data in the highest resolution you can.
regards, Bird
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