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Thanks for the comprehensive reply Andy. You were partly right about
sucking eggs; I understand the physics of it all, having been doing
astro for over 60 years, BUT, and it's a big but, I have almost no digital image processing skills at all, having always struggled with computers. No amount of video tutorials, or hours spent reading
PS books, can get it to stay in my head. The end result is that I work
with JPEGS, no separate darks, flats etc: and almost entirely in DSS.
I wasted my money buying PS, can't get my head around it. Ditto
to a degree with Backyard EOS. I had an attack of a thing called transient global amnesia several yrs ago, and ever since, my short term memory has been c--p.
Incidentally, with the DSS histogram, if I put one colour slightly to the right of the rest of the cone, the whole image takes on a hint of that colour, not just the part of the image that is naturally that colour.
cheers raymo
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