Click here if you are having trouble logging into the forums Cloudy Nights - Official Forums of the 2009 International Year of Astronomy Privacy Policy | Please read our Terms of Service | Signup and Troubleshooting FAQ | Problems? PM a Red or a Green Gu.... uh, User   You are not logged in. [Login] Entrance · Main Index · Search · New user · Who's Online FAQ · Calendar Astrophotography and Sketching >> Beginning Imaging Previous   Index   Next   Threaded   Pages: 1 EricJD super member Reged: 07/24/07 Posts: 112 Loc: Chesapeake VA More image problems.       #2596815 - 08/22/08 02:40 PM Edit   Reply   Quote Quick Reply   Thanks to those that solved my 'smudge' problem the other day. Today I have a new one that you can see here: I'm using a DSI Pro and Deep Sky Stacker with Median combine, stacking lights and darks only. Any idea where the black dots are coming from? -------------------- Orion 120mm @ f5 Post Extras:       DaemonGPF Pooh-Bah Reged: 03/22/08 Posts: 1428 Loc: New Mexico Re: More image problems. [Re: EricJD]       #2596860 - 08/22/08 03:12 PM Edit   Reply   Quote Quick Reply   I get those black dots prominently when I run "Noise Despeckle" in Paintshop if I don't remove all the hot pixels in the image first. In your case though, they seem a little too frequent.. What happens when you combine in another application? Just curious. -------------------- -Josh *Orion Starblast Imaging 150mm OTA *Orion Starblast Imaging 114mm OTA *Meade 50mm AR short tube OTA *Meade DSI Pro IIc *Orion Starshoot DSCI *CG5 mount http://cleardarksky.com/c/AlbuqNMkey.html My Messier Project Gallery Post Extras:       DaemonGPF Pooh-Bah Reged: 03/22/08 Posts: 1428 Loc: New Mexico Re: More image problems. [Re: DaemonGPF]       #2596863 - 08/22/08 03:14 PM Edit   Reply   Quote Quick Reply   Hmmm.. after saving your file and blowing it up larger, it looks more like banding, not so much spots. The bands and gaps are covering your whole file when you zoom in. I have no clue on that one, sorry. -------------------- -Josh *Orion Starblast Imaging 150mm OTA *Orion Starblast Imaging 114mm OTA *Meade 50mm AR short tube OTA *Meade DSI Pro IIc *Orion Starshoot DSCI *CG5 mount http://cleardarksky.com/c/AlbuqNMkey.html My Messier Project Gallery Post Extras:       DaemonGPF Pooh-Bah Reged: 03/22/08 Posts: 1428 Loc: New Mexico Re: More image problems. [Re: DaemonGPF]       #2596868 - 08/22/08 03:20 PM Edit   Reply   Quote Quick Reply   Cheating it a little, I took your file and applied a very light gausian blur and then a light unsharp mask and it cleared most of it up in one pass. -------------------- -Josh *Orion Starblast Imaging 150mm OTA *Orion Starblast Imaging 114mm OTA *Meade 50mm AR short tube OTA *Meade DSI Pro IIc *Orion Starshoot DSCI *CG5 mount http://cleardarksky.com/c/AlbuqNMkey.html My Messier Project Gallery Post Extras:       Nils_Lars scholastic sledgehammer Reged: 01/04/08 Posts: 903 Loc: Santa Cruz Mountains , CA Re: More image problems. [Re: DaemonGPF]       #2596915 - 08/22/08 03:43 PM Edit   Reply   Quote Quick Reply   Im not familiar with that imager but it looks like a high gain or you just need longer subs. -------------------- Erik Orion ED 80 Orion Atlas GOTO mount Williams Optics reducer Various eyepieces and other gear Baytronix 80mm guidescope Orion Starshoot Autoguider PHD guide Canon 400D (unmodded) Stilleto Focuser Tamron 75-300mm&28-80mm lenses NexImage webcam http://home.comcast.net/~eriknlarsen/site/?/photos/ Post Extras:       AlanT sage Reged: 08/20/07 Posts: 271 Loc: 122º36' W, 47º37' N, WA USA Re: More image problems. [Re: Nils_Lars]       #2597003 - 08/22/08 04:28 PM Edit   Reply   Quote Quick Reply   I agree there is some banding in there (but pretty dim). I sometimes get that on an occasional frame. You might look through the Light frames and discard any bad ones. But also, it sorta looks to me like the darks may not be right (for the light frames taken).... or maybe they've been subtracted twice? A couple questions: 1. What software did you use for capture? If you used Envisage, did you have the "Subtract Darks" box checked or not. If so, your "light frames" are already dark subtracted. 2. Were the Darks taken the same night, at the same temperature? The DSI cameras are very sensitive to temperature shift. Just a few degrees F makes a difference. As a note, your image is presented as if the pixels are square. The pixels on a DSI are 9.6 H x 7.5 V. so when scaled, the normal image aspect ratio will be roughly 4 x 3 rather than the almost square image you have here. The natural image size for a DSI is a just a bit bigger than 640 x 480. al -------------------- Meade 80mm APO Celestron C6 CGE, CG-5 GT DSI Pro, DSI Pro II, ST-2000xcm Post Extras:       RandallK professor emeritus Reged: 11/10/06 Posts: 713 Loc: Nanaimo, B. C. Canada Re: More image problems. [Re: AlanT]       #2597164 - 08/22/08 06:09 PM Edit   Reply   Quote Quick Reply   You didn't by any chance switch to another "window" while imaging? I did this with my Orion (Original DSCI), while taking darks and it created streaks through them. If I didn't switch windows and let it do it's thing, everything comes out fine. Also, could it maybe be a thermal problem? -------------------- Scopes: Meade SC-8AT w UHTC SkyWatcher 5" F/5 Reflector SkyWatcher 127mm MAK Mount: HEQ5 Pro Cameras: Orion Starshoot DS Colour Imager V.1 Imaging Source Webcam DMK21AU04.AS Palm TX PDA w Astromist and Bluetooth wireles control. Post Extras:       EricJD super member Reged: 07/24/07 Posts: 112 Loc: Chesapeake VA Re: More image problems. [Re: RandallK]       #2597170 - 08/22/08 06:13 PM Edit   Reply   Quote Quick Reply   Well, I guess my problem is my dark then. I didn't take it the same night. Oh well, time for a do-over. Thanks everyone for the advice. -------------------- Orion 120mm @ f5 Post Extras:       DaemonGPF Pooh-Bah Reged: 03/22/08 Posts: 1428 Loc: New Mexico Re: More image problems. [Re: EricJD]       #2597235 - 08/22/08 06:44 PM Edit   Reply   Quote Quick Reply   Well, the best way to narrow it down would be to look at the exposures without dark subtraction. Are those bands/spots present? -------------------- -Josh *Orion Starblast Imaging 150mm OTA *Orion Starblast Imaging 114mm OTA *Meade 50mm AR short tube OTA *Meade DSI Pro IIc *Orion Starshoot DSCI *CG5 mount http://cleardarksky.com/c/AlbuqNMkey.html My Messier Project Gallery Post Extras:       EricJD super member Reged: 07/24/07 Posts: 112 Loc: Chesapeake VA Re: More image problems. [Re: DaemonGPF]       #2597360 - 08/22/08 07:57 PM Edit   Reply   Quote Quick Reply   Yes, they are. -------------------- Orion 120mm @ f5 Post Extras:       AlanT sage Reged: 08/20/07 Posts: 271 Loc: 122º36' W, 47º37' N, WA USA Re: More image problems. [Re: EricJD]       #2597378 - 08/22/08 08:06 PM Edit   Reply   Quote Quick Reply   Are the bands on all or just some of the frames? If on all the frames I'd be suspicious of the USB hookup (cable, hub, etc.), or maybe the capture software. What software, and what exposure time? al -------------------- Meade 80mm APO Celestron C6 CGE, CG-5 GT DSI Pro, DSI Pro II, ST-2000xcm Post Extras:       Pages: 1 Previous   Index   Next   Threaded   Extra information 3 registered and 9 anonymous users are browsing this forum. 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