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I spent many years contributing to an international Landscape Forum (FM), and there it was unthinkable that anyone would process another person's image without asking first - even then, highly unusual.
The finished image is an artwork, not just a bunch of data. For better or worse, the result is a personal statement.
Astro image processing is, however, complex and at times very difficult, so constructive help in the form of reprocessing the data accompanied by a description of what was done may be warranted.
But the key point remains:it is good etiquette to ask first.
Mark
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