Quote:
Originally Posted by raymo
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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Hi Raymo, just saw your reply - sorry to hear about the short term memory, you really have my sympathy for that. And you do very well with your images! I wish I had good advice about the histogram sliders in DSS for you - areas like this are so tricky.
I hear you about putting an overall cast on the image, I'm guessing a bit, but I think that's in part because the wanted and unwanted colour distribution is not uniform across a single channel of the histogram, so uniform changes don't always correct for things like light pollution in a way we'd like. I'm not quite sure what to suggest - I've had a lot of joy with the various colour balancing utilities in PixInsight (which doesn't help you) - but I suspect their colour balancing is not as simple as clipping and gamma (middle slider) each colour channel. And that's the reason I'm so interested now - I have a Lagoon pic with nice eggy stars
and a difficult colour balance that PI's colour tools don't work so well on as there are no good black and white reference points.