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Hi Bert
well, my initial test was unsuccessful.
The resultant FWHM of stars in the sum-combined image (consisting of upscaled images before the combination), was larger by a factor of 33%..and visibly obvious when blinking the images. (This is FSQ/STX data, 3.5asp, so well undersampled).
I used CCDSTACK and a quadratic bispline algorithim to upscale, then I used the same procedure to downscale the image at the end. I have heard that a bispline algorithim smears light in stars - which could explain it.
Thoughts?
cheers
Martin
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