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Hi Rick,
Indeed, I've performed various levels of data scaling before to produce a composite image from different focal length instruments. When a opportunity arises that I can reuse data previously collected, I tend to opt for downsizing a luminance to match a wide field image. I have also done the opposite, but only with chrominance data. Luminance data being upscaled tends to lose its resolution if not done carefully. If you have a quick search on data scaling / upsizing on these forums you'll see some of the results I've produced. Happy to answer any questions you may have.
Cheers
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