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Old 28-04-2008, 12:58 AM
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bluescope
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Hi All

I managed to get some decent shots of Eta last Friday night as we had clear skies here.

I remember reading an article on processing the stars in images to make them less " in your face " in the image, if you know what I mean. Is there any easy way to blend them instead of having stark white blobs ? If anyone can do it with this image and re post it in this thread with tips on processing it would be appreciated.



SW 254mm F4.7 Newt, ST2000XCM,EQ6 Pro, Baader UV/IR and UHC-S filters.
5 x 5min subs, stacked DSS
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  #2  
Old 28-04-2008, 01:32 AM
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strongmanmike (Michael)
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Nice work Steve, I like your framing .

The white star issue seems to plague many DSLR images and I think it is to do with it being easy to over saturating them? You use a one shot color camera yes? These are basically coooled DSLR's as they have the colour matrix over the pixels too. I use a mono CCD so to be honest I am not exactly sure what you should do but more shorter exposures added together might work? What do others think? I am sure there is a good explanation?

Mike
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Old 28-04-2008, 02:44 AM
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Quote:
Originally Posted by strongmanmike View Post
Nice work Steve, I like your framing .

The white star issue seems to plague many DSLR images and I think it is to do with it being easy to over saturating them? You use a one shot color camera yes? These are basically coooled DSLR's as they have the colour matrix over the pixels too. I use a mono CCD so to be honest I am not exactly sure what you should do but more shorter exposures added together might work? What do others think? I am sure there is a good explanation?

Mike

Thanks Mike, lets see what others come up with ! I think the shorter exposures may help but as I said I did read an article, which I may have archived somewhere, that explained a processing technique to help tame the little beasts. Hopefully someone else has read it or indeed uses the technique.

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Old 28-04-2008, 09:50 AM
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Nice Hanson!
I think a lot of us get those blown out stars.
I find selecting the brighter stars then a light minimum filter helps to soften them as well as shrink them a little.

Done a similar shot myself the other night before moonrise which I am just about to post..
cheers
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  #5  
Old 28-04-2008, 11:04 AM
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renormalised (Carl)
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I don't mind if the stars look a bit blown out....makes the piccie look dramatic. I guess, though, it's upto the individual's taste.
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  #6  
Old 28-04-2008, 12:13 PM
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A great looking image Steve, nice colour and detail in the Keyhole.

Cheers
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  #7  
Old 28-04-2008, 02:38 PM
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Quote:
Originally Posted by Garyh View Post
Nice Hanson!
I think a lot of us get those blown out stars.
I find selecting the brighter stars then a light minimum filter helps to soften them as well as shrink them a little.

Done a similar shot myself the other night before moonrise which I am just about to post..
cheers
Thanks Gary. What's a light minimum filter ? In what program ?

Quote:
Originally Posted by renormalised View Post
I don't mind if the stars look a bit blown out....makes the piccie look dramatic. I guess, though, it's upto the individual's taste.
I just think the bloated stars take the eye away from the main subject detail.

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Originally Posted by Ric View Post
A great looking image Steve, nice colour and detail in the Keyhole.

Cheers
Cheers Ric !
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  #8  
Old 28-04-2008, 05:26 PM
Alchemy (Clive)
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Quote:
Originally Posted by Garyh View Post
Nice Hanson!
I find selecting the brighter stars then a light minimum filter helps to soften them as well as shrink them a little.
this works best on a refractor, star spikes will tend to square up the stars a bit , be carefull not to go too hard too early as you will end up with halos around the stars.

the process gary is talking about probably uses Photoshop using
SELECT-COLOR RANGE tool, followed with FILTER -OTHER -MINIMUM. It would pay also to use a feather if you want to try this process, SELECT -FEATHER. it takes a bit of fiddling to make it look natural. Heres a thought for you to consider, what appears as wrong, or noisy or not natural may not show up when you resize it to the 200kb limit
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Old 28-04-2008, 06:17 PM
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Nice Keyhole Steve, great colour and detail.

Well done.
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  #10  
Old 29-04-2008, 11:29 AM
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Quote:
Originally Posted by Alchemy View Post
this works best on a refractor, star spikes will tend to square up the stars a bit , be carefull not to go too hard too early as you will end up with halos around the stars.

the process gary is talking about probably uses Photoshop using
SELECT-COLOR RANGE tool, followed with FILTER -OTHER -MINIMUM. It would pay also to use a feather if you want to try this process, SELECT -FEATHER. it takes a bit of fiddling to make it look natural. Heres a thought for you to consider, what appears as wrong, or noisy or not natural may not show up when you resize it to the 200kb limit
Thanks Alchemy that sounds like what I read although I seem to remember the article going into rheems of detailed instructions that prompted me to put it in the too hard basket at the time. Thanks again for the tip I will give it a go, and ofcourse thanks again to you Gary.



Quote:
Originally Posted by Matty P View Post
Nice Keyhole Steve, great colour and detail.

Well done.
Thanks Matt, glad you like it !

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