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Rankinstudio
sage
Reged: 04/05/08
Posts: 412
Loc: Salt Lake City, UT, Lake Powel...
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Ok, so I have been at this for a few years now and feel I am getting pretty good at processing, but one thing that still gives me a hard time is keeping my stars tame while stretching the image. It tends to blow the stars out something fierce and I was wondering if I could get some input on how others go about this, and preserving the stars and star color. I have tried selection masks, layer masks, they always end up with these ugly halos around them or still getting blown out.
Thanks 
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David Rankin
http://www.rankinstudio.com
Astro Gallery
Orion 254mm F4.7 (imaging scope)
Baader MPCC
Quickcam pro 9000 (guider, imager)
Canon Rebel XSi (self modified)
Atlas EQ-G (EQ MOD)
Canon 50mm F1.8 II Lens
Canon 28-200 F3.2 Lens
DSLR peltier cooler
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caliu
super member
Reged: 06/09/06
Posts: 189
Loc: Spain
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Hi David,
The solution is to construct a mask for stars, it is easy, it extracts the luminance image (BW) and invert it, it applies the mask on the image and to process happily
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http://www.caliu.fotografiaastronomica.com
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Astro Tech 66
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Rankinstudio
sage
Reged: 04/05/08
Posts: 412
Loc: Salt Lake City, UT, Lake Powel...
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How do you go about doing that in photoshop?
Thanks
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David Rankin
http://www.rankinstudio.com
Astro Gallery
Orion 254mm F4.7 (imaging scope)
Baader MPCC
Quickcam pro 9000 (guider, imager)
Canon Rebel XSi (self modified)
Atlas EQ-G (EQ MOD)
Canon 50mm F1.8 II Lens
Canon 28-200 F3.2 Lens
DSLR peltier cooler
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justabob
Carpal Tunnel
Reged: 05/05/07
Posts: 1679
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David
I have had some success with this method.
http://stargazerslounge.com/imaging-tips-tricks-techniques/47063-5-creating-star-layer.html
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http://www.pbase.com/rkn/astro&page=all
Vixen Sphinx SXW
Meade sn6
Canon EF 200mm f/2.8L II USM Lens
Hutech 1000d
Self modded 350d
ST8300c on order
DSI PRO II
Bob
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Rankinstudio
sage
Reged: 04/05/08
Posts: 412
Loc: Salt Lake City, UT, Lake Powel...
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Much thanks Bob
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David Rankin
http://www.rankinstudio.com
Astro Gallery
Orion 254mm F4.7 (imaging scope)
Baader MPCC
Quickcam pro 9000 (guider, imager)
Canon Rebel XSi (self modified)
Atlas EQ-G (EQ MOD)
Canon 50mm F1.8 II Lens
Canon 28-200 F3.2 Lens
DSLR peltier cooler
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waassaabee
Carpal Tunnel
Reged: 11/26/07
Posts: 2695
Loc: Central California Coast
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Yeah!! Thanks Bob!!
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Gary
34N 120W
-My kingdom for blue squares!-
WO Megrez 90FD/TV 0.8x FR/FF
AT8RC
mini Borg 50/Q-Guide/PHD
CGEM
Canon 350D Hap Griffin Baader mod - o.o
My Friend Flickr
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bebert
sage
Reged: 07/21/08
Posts: 247
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I'm not sure what software you're using to stack but DSS will generate a star mask for you during the stacking process. You then bring that into PS along with your image. Haven't tried the other method - perhaps it's better.
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Celestron C8
Orion 80 ED
Vixen 70s for guiding
CG5-ASGT
SSAG
PHD Guiding
Canon 300D(a)
Celestron 0.63 focal reducer
WO 0.8x FF/FR version II
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justabob
Carpal Tunnel
Reged: 05/05/07
Posts: 1679
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Also, if you guys got the latest carboni tools, the action select brighter stars creates a star channel that can be saved as a layer.
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http://www.pbase.com/rkn/astro&page=all
Vixen Sphinx SXW
Meade sn6
Canon EF 200mm f/2.8L II USM Lens
Hutech 1000d
Self modded 350d
ST8300c on order
DSI PRO II
Bob
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Mick Hyde
Pooh-Bah
Reged: 11/22/06
Posts: 1126
Loc: Swindon, UK
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Quote:
Also, if you guys got the latest carboni tools, the action select brighter stars creates a star channel that can be saved as a layer.
Bob, do you or anyone else have any instructions on using this?
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Mick.
http://astromick.blogspot.com http://mickhyde.googlepages.com Swindon CSC
Celestron 9.25 XLT, Takahashi SKY-90, Canon EOS 50D, DMK21AF04AS, SKYnyx 2-0M, CGE mount.
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