BTW These artifacts don't appear to be hot pixels. I wonder if they were caused by not setting an offset during acquisition. That may flip them to the other side (dark to brightest). I will check that next time.
How to despeckle in PI?
- SkyHiker
- Articles: 0
- Posts: 2293
- Joined: Sat May 11, 2019 8:40 pm
- 5
- Location: Santa Barbara, CA
- Status:
Offline
-
TSS Photo of the Day
TSS Awards Badges
How to despeckle in PI?
BTW These artifacts don't appear to be hot pixels. I wonder if they were caused by not setting an offset during acquisition. That may flip them to the other side (dark to brightest). I will check that next time.
- Juno16
- Articles: 0
- Posts: 8210
- Joined: Sun May 12, 2019 3:13 pm
- 5
- Location: Mississippi Gulf Coast
- Status:
Offline
-
TSS Awards Badges
TSS Photo of the Day
Re: How to despeckle in PI?
I'm no expert though. I only have learned by my own experiences (issues).
They do look like hot pixels to me. How did you pre-process? If you used WBPP, are you using any cosmetic correction? If yes and no, you could try that and save the CC template and apply it in WBPP.
Or, you could bring it into
Just some ideas.
Scopes: Explore Scientific ED102 APO, Sharpstar 61 EDPH II APO, Samyang 135 F2 (still on the Nikon).
Mount: Skywatcher HEQ5 Pro with Rowan Belt Mod
Stuff: ASI EAF Focus Motor (x2), ZWO OAG, ZWO 30 mm Guide Scope, ASI 220mm min, ASI 120mm mini, Stellarview 0.8 FR/FF, Sharpstar 0.8 FR/FF, Mele Overloock 3C.
Camera/Filters/Software: ASI 533 mc pro, ASI 120mm mini, ASI 220mm mini , IDAS LPS D-1, Optolong L-Enhance, ZWO UV/IR Cut, N.I.N.A., Green Swamp Server, PHD2, Adobe Photoshop CC, Pixinsight.
Dog and best bud: Jack
Sky: Bortle 6-7
My Astrobin: https://www.astrobin.com/users/Juno16/
- AstroBee Online
- Moderator
- Articles: 0
- Posts: 2362
- Joined: Thu Nov 14, 2019 11:03 pm
- 4
- Location: Henderson, NV
- Status:
Online
-
TSS Awards Badges
TSS Photo of the Day
Re: How to despeckle in PI?
Scopes: Celestron EdgeHD14", Explore Scientific ED152CF & ED127 APO's, StellarVue SV70T, Classic Orange-Tube C-8, Lunt 80mm Ha double-stack solar scope.
Mounts: Astro-Physics Mach One, iOptron CEM70EC Mount, iOptron ZEQ25 Mount.
Cameras: ZWO ASI2600mm Pro, ZWO 2600MC Pro, ZWO ASI1600mm
Filters: 36mm Chroma LRGB & 3nm Ha, OIII, SII, L-Pro, L-eXtreme
Eyepieces: 27mm TeleVue Panoptic, 4mm TeleVue Radian, Explore Scientific 82° 30mm, 6.7mm , Baader 13mm Hyperion, Explore Scientific 70° 10mm, 15mm, 20mm, Meade 8.8mm UWA
Software: N.I.N.A., SharpCapPro, PixInsight, PhotoShop CC, Phd2, Stellarium
https://www.nevadadesertskies.com
- SkyHiker
- Articles: 0
- Posts: 2293
- Joined: Sat May 11, 2019 8:40 pm
- 5
- Location: Santa Barbara, CA
- Status:
Offline
-
TSS Photo of the Day
TSS Awards Badges
Re: How to despeckle in PI?
Thanks Jim and Greg,Juno16 wrote: ↑Sat Aug 19, 2023 10:35 pm No clue!
I'm no expert though. I only have learned by my own experiences (issues).
They do look like hot pixels to me. How did you pre-process? If you used WBPP, are you using any cosmetic correction? If yes and no, you could try that and save the CC template and apply it in WBPP.
Or, you could bring it into Gimp, for Despeckle, then back to PI.
Just some ideas.
I tried automatic cosmetic correction with various parameter values but it didn't work. I can't try CC with master dark because my camera doesn't need darks. I will just use a
- Juno16
- Articles: 0
- Posts: 8210
- Joined: Sun May 12, 2019 3:13 pm
- 5
- Location: Mississippi Gulf Coast
- Status:
Offline
-
TSS Awards Badges
TSS Photo of the Day
Re: How to despeckle in PI?
Why do you you feel that your camera doesn't need darks?
I have a ASI533MC (
My dark library is 2 1/2 years old (yes, I am lazy), but it still does the trick and I have not had any issues with hot pixels (since employing CC).
Here is one of my stretched darks.
Here is the same dark zoomed in.
Scopes: Explore Scientific ED102 APO, Sharpstar 61 EDPH II APO, Samyang 135 F2 (still on the Nikon).
Mount: Skywatcher HEQ5 Pro with Rowan Belt Mod
Stuff: ASI EAF Focus Motor (x2), ZWO OAG, ZWO 30 mm Guide Scope, ASI 220mm min, ASI 120mm mini, Stellarview 0.8 FR/FF, Sharpstar 0.8 FR/FF, Mele Overloock 3C.
Camera/Filters/Software: ASI 533 mc pro, ASI 120mm mini, ASI 220mm mini , IDAS LPS D-1, Optolong L-Enhance, ZWO UV/IR Cut, N.I.N.A., Green Swamp Server, PHD2, Adobe Photoshop CC, Pixinsight.
Dog and best bud: Jack
Sky: Bortle 6-7
My Astrobin: https://www.astrobin.com/users/Juno16/
- AstroBee Online
- Moderator
- Articles: 0
- Posts: 2362
- Joined: Thu Nov 14, 2019 11:03 pm
- 4
- Location: Henderson, NV
- Status:
Online
-
TSS Awards Badges
TSS Photo of the Day
Re: How to despeckle in PI?
Scopes: Celestron EdgeHD14", Explore Scientific ED152CF & ED127 APO's, StellarVue SV70T, Classic Orange-Tube C-8, Lunt 80mm Ha double-stack solar scope.
Mounts: Astro-Physics Mach One, iOptron CEM70EC Mount, iOptron ZEQ25 Mount.
Cameras: ZWO ASI2600mm Pro, ZWO 2600MC Pro, ZWO ASI1600mm
Filters: 36mm Chroma LRGB & 3nm Ha, OIII, SII, L-Pro, L-eXtreme
Eyepieces: 27mm TeleVue Panoptic, 4mm TeleVue Radian, Explore Scientific 82° 30mm, 6.7mm , Baader 13mm Hyperion, Explore Scientific 70° 10mm, 15mm, 20mm, Meade 8.8mm UWA
Software: N.I.N.A., SharpCapPro, PixInsight, PhotoShop CC, Phd2, Stellarium
https://www.nevadadesertskies.com
- SkyHiker
- Articles: 0
- Posts: 2293
- Joined: Sat May 11, 2019 8:40 pm
- 5
- Location: Santa Barbara, CA
- Status:
Offline
-
TSS Photo of the Day
TSS Awards Badges
Re: How to despeckle in PI?
Because everybody said the ASI2600 does not need darks when it first came out.
There are still lots of people that say you need them but usually they don't have an ASI2600, or they have never done the comparison.
Here is a comparison of 3 images by someone who tried it out.
Elsewhere I read that the histogram for darks up to 600 seconds is below 100, which is negligible.
From my own experience, I have not seen a trace of dark current that I was used to with my Fuji X-a1.
I use bias frames to remove the hot pixels. That should suffice I should think.
- SkyHiker
- Articles: 0
- Posts: 2293
- Joined: Sat May 11, 2019 8:40 pm
- 5
- Location: Santa Barbara, CA
- Status:
Offline
-
TSS Photo of the Day
TSS Awards Badges
Re: How to despeckle in PI?
If I don't stretch the master bias, it is black. I hope that is a valid check that my camera has zero hot pixels, which is much more than I wanted to believe. I checked the maximum value, it is 0.02.
To figure out how to do a histogram in
- AstroBee Online
- Moderator
- Articles: 0
- Posts: 2362
- Joined: Thu Nov 14, 2019 11:03 pm
- 4
- Location: Henderson, NV
- Status:
Online
-
TSS Awards Badges
TSS Photo of the Day
Re: How to despeckle in PI?
Scopes: Celestron EdgeHD14", Explore Scientific ED152CF & ED127 APO's, StellarVue SV70T, Classic Orange-Tube C-8, Lunt 80mm Ha double-stack solar scope.
Mounts: Astro-Physics Mach One, iOptron CEM70EC Mount, iOptron ZEQ25 Mount.
Cameras: ZWO ASI2600mm Pro, ZWO 2600MC Pro, ZWO ASI1600mm
Filters: 36mm Chroma LRGB & 3nm Ha, OIII, SII, L-Pro, L-eXtreme
Eyepieces: 27mm TeleVue Panoptic, 4mm TeleVue Radian, Explore Scientific 82° 30mm, 6.7mm , Baader 13mm Hyperion, Explore Scientific 70° 10mm, 15mm, 20mm, Meade 8.8mm UWA
Software: N.I.N.A., SharpCapPro, PixInsight, PhotoShop CC, Phd2, Stellarium
https://www.nevadadesertskies.com
- Juno16
- Articles: 0
- Posts: 8210
- Joined: Sun May 12, 2019 3:13 pm
- 5
- Location: Mississippi Gulf Coast
- Status:
Offline
-
TSS Awards Badges
TSS Photo of the Day
Re: How to despeckle in PI?
I had really good success with WBPP until one dataset. I had hot pixels scattered throughout the stretched masterlight.
I submitted a thread to the
https://pixinsight.com/forum/index.php? ... sue.16560/
Take care and good luck!
Scopes: Explore Scientific ED102 APO, Sharpstar 61 EDPH II APO, Samyang 135 F2 (still on the Nikon).
Mount: Skywatcher HEQ5 Pro with Rowan Belt Mod
Stuff: ASI EAF Focus Motor (x2), ZWO OAG, ZWO 30 mm Guide Scope, ASI 220mm min, ASI 120mm mini, Stellarview 0.8 FR/FF, Sharpstar 0.8 FR/FF, Mele Overloock 3C.
Camera/Filters/Software: ASI 533 mc pro, ASI 120mm mini, ASI 220mm mini , IDAS LPS D-1, Optolong L-Enhance, ZWO UV/IR Cut, N.I.N.A., Green Swamp Server, PHD2, Adobe Photoshop CC, Pixinsight.
Dog and best bud: Jack
Sky: Bortle 6-7
My Astrobin: https://www.astrobin.com/users/Juno16/
- SkyHiker
- Articles: 0
- Posts: 2293
- Joined: Sat May 11, 2019 8:40 pm
- 5
- Location: Santa Barbara, CA
- Status:
Offline
-
TSS Photo of the Day
TSS Awards Badges
Re: How to despeckle in PI?
Very interesting! I went straight back toJuno16 wrote: ↑Sun Aug 20, 2023 3:00 am Just try to pass on my experience with Cosmetic Correction.
I had really good success with WBPP until one dataset. I had hot pixels scattered throughout the stretched masterlight.
I submitted a thread to the PI forum.
https://pixinsight.com/forum/index.php? ... sue.16560/
Take care and good luck!
Because
- SkyHiker
- Articles: 0
- Posts: 2293
- Joined: Sat May 11, 2019 8:40 pm
- 5
- Location: Santa Barbara, CA
- Status:
Offline
-
TSS Photo of the Day
TSS Awards Badges
Re: How to despeckle in PI?
- SkyHiker
- Articles: 0
- Posts: 2293
- Joined: Sat May 11, 2019 8:40 pm
- 5
- Location: Santa Barbara, CA
- Status:
Offline
-
TSS Photo of the Day
TSS Awards Badges
Re: How to despeckle in PI?
From old
I take my bias files in Ekos with the telescope cover closed, however usually on the next morning - not in the dark - at the shortest exposure that I can set. I always assumed that zero external light would be photographed, and I still presume that, but I don't know for sure.
- Juno16
- Articles: 0
- Posts: 8210
- Joined: Sun May 12, 2019 3:13 pm
- 5
- Location: Mississippi Gulf Coast
- Status:
Offline
-
TSS Awards Badges
TSS Photo of the Day
Re: How to despeckle in PI?
SkyHiker wrote: ↑Sun Aug 20, 2023 3:44 amVery interesting! I went straight back toJuno16 wrote: ↑Sun Aug 20, 2023 3:00 am Just try to pass on my experience with Cosmetic Correction.
I had really good success with WBPP until one dataset. I had hot pixels scattered throughout the stretched masterlight.
I submitted a thread to the PI forum.
https://pixinsight.com/forum/index.php? ... sue.16560/
Take care and good luck!DSS and found the same area as in thePI preview. I see the same speckles inDSS ! This is different than what yourPI thread is about I think, because in your caseDSS did not produce the speckles. They are fatter just like the stars, but that may be because I stretched the heck out of it.
dssSpeckle.jpg
BecauseDSS andPI show very consistent speckles, it is unlikely to be caused by the processing. It must be in the raw data. I wonder if I add an offset next time, they will go away. Otherwise, if the bias master is not exact, it may subtract to a negative value, which is a very high value in fixed point.
Is CC enabled in
You might have mentioned earlier, but what offset are you using?
I’m using 30 on my ASI533
Since you have an affected dataset, why not try shooting some darks and use CC in WBPP. Hopefully your data can be salvaged.
Much easier than re-shooting the dataset.
Scopes: Explore Scientific ED102 APO, Sharpstar 61 EDPH II APO, Samyang 135 F2 (still on the Nikon).
Mount: Skywatcher HEQ5 Pro with Rowan Belt Mod
Stuff: ASI EAF Focus Motor (x2), ZWO OAG, ZWO 30 mm Guide Scope, ASI 220mm min, ASI 120mm mini, Stellarview 0.8 FR/FF, Sharpstar 0.8 FR/FF, Mele Overloock 3C.
Camera/Filters/Software: ASI 533 mc pro, ASI 120mm mini, ASI 220mm mini , IDAS LPS D-1, Optolong L-Enhance, ZWO UV/IR Cut, N.I.N.A., Green Swamp Server, PHD2, Adobe Photoshop CC, Pixinsight.
Dog and best bud: Jack
Sky: Bortle 6-7
My Astrobin: https://www.astrobin.com/users/Juno16/
- AstroBee Online
- Moderator
- Articles: 0
- Posts: 2362
- Joined: Thu Nov 14, 2019 11:03 pm
- 4
- Location: Henderson, NV
- Status:
Online
-
TSS Awards Badges
TSS Photo of the Day
Re: How to despeckle in PI?
DarkFlats are shot at whatever exposure your flats are shot at. I use a dimmable
Scopes: Celestron EdgeHD14", Explore Scientific ED152CF & ED127 APO's, StellarVue SV70T, Classic Orange-Tube C-8, Lunt 80mm Ha double-stack solar scope.
Mounts: Astro-Physics Mach One, iOptron CEM70EC Mount, iOptron ZEQ25 Mount.
Cameras: ZWO ASI2600mm Pro, ZWO 2600MC Pro, ZWO ASI1600mm
Filters: 36mm Chroma LRGB & 3nm Ha, OIII, SII, L-Pro, L-eXtreme
Eyepieces: 27mm TeleVue Panoptic, 4mm TeleVue Radian, Explore Scientific 82° 30mm, 6.7mm , Baader 13mm Hyperion, Explore Scientific 70° 10mm, 15mm, 20mm, Meade 8.8mm UWA
Software: N.I.N.A., SharpCapPro, PixInsight, PhotoShop CC, Phd2, Stellarium
https://www.nevadadesertskies.com
- SkyHiker
- Articles: 0
- Posts: 2293
- Joined: Sat May 11, 2019 8:40 pm
- 5
- Location: Santa Barbara, CA
- Status:
Offline
-
TSS Photo of the Day
TSS Awards Badges
Re: How to despeckle in PI?
Juno16 wrote: ↑Sun Aug 20, 2023 10:31 amSkyHiker wrote: ↑Sun Aug 20, 2023 3:44 amVery interesting! I went straight back toJuno16 wrote: ↑Sun Aug 20, 2023 3:00 am Just try to pass on my experience with Cosmetic Correction.
I had really good success with WBPP until one dataset. I had hot pixels scattered throughout the stretched masterlight.
I submitted a thread to the PI forum.
https://pixinsight.com/forum/index.php? ... sue.16560/
Take care and good luck!DSS and found the same area as in thePI preview. I see the same speckles inDSS ! This is different than what yourPI thread is about I think, because in your caseDSS did not produce the speckles. They are fatter just like the stars, but that may be because I stretched the heck out of it.
dssSpeckle.jpg
BecauseDSS andPI show very consistent speckles, it is unlikely to be caused by the processing. It must be in the raw data. I wonder if I add an offset next time, they will go away. Otherwise, if the bias master is not exact, it may subtract to a negative value, which is a very high value in fixed point.
Is CC enabled inDSS ?
I mentioned that right away as the possible source of the problem. I had not set any.
That's not a problem at all,
- SkyHiker
- Articles: 0
- Posts: 2293
- Joined: Sat May 11, 2019 8:40 pm
- 5
- Location: Santa Barbara, CA
- Status:
Offline
-
TSS Photo of the Day
TSS Awards Badges
Re: How to despeckle in PI?
I'm curious how much difference it makes. The link I provided has three images as evidence that taking darks and dark flats makes no difference at all for the ASI2600. I don't know if you have tried this yourself. I may try it to see if it makes a difference once I get to the point where it is useful. Based on the evidence, I doubt if it will. For now, I have gradients from streetlights and fog that are much more of a concern. It's off topic, something for a new thread.AstroBee wrote: ↑Sun Aug 20, 2023 12:59 pm Henk, most folks shooting with modern CMOS cameras are not even shooting BIAS frames. They are shooting DarkFlats. That's what I do with my 2600MM and 2600MC. And I can tell you for sure that both cameras have hot pixels.
DarkFlats are shot at whatever exposure your flats are shot at. I use a dimmable ASCOM controllable light panel so I shoot all of my LRGB flats at 1 sec and my narrowband flats at 3 sec. That way I can shoot just one set of DarkFlats for broadband and one set for narrowband.
- Juno16
- Articles: 0
- Posts: 8210
- Joined: Sun May 12, 2019 3:13 pm
- 5
- Location: Mississippi Gulf Coast
- Status:
Offline
-
TSS Awards Badges
TSS Photo of the Day
Re: How to despeckle in PI?
Does the FITS header display a “0” offset?
I also use darkflats with my camera. I just use an inexpensive light panel (or my ipad) for my flats and manually adjust exposure in the 1-5 second range to aim for 50% max adu for my sensor. Cap it and run darkflats (in a dark room or outside at night).
Scopes: Explore Scientific ED102 APO, Sharpstar 61 EDPH II APO, Samyang 135 F2 (still on the Nikon).
Mount: Skywatcher HEQ5 Pro with Rowan Belt Mod
Stuff: ASI EAF Focus Motor (x2), ZWO OAG, ZWO 30 mm Guide Scope, ASI 220mm min, ASI 120mm mini, Stellarview 0.8 FR/FF, Sharpstar 0.8 FR/FF, Mele Overloock 3C.
Camera/Filters/Software: ASI 533 mc pro, ASI 120mm mini, ASI 220mm mini , IDAS LPS D-1, Optolong L-Enhance, ZWO UV/IR Cut, N.I.N.A., Green Swamp Server, PHD2, Adobe Photoshop CC, Pixinsight.
Dog and best bud: Jack
Sky: Bortle 6-7
My Astrobin: https://www.astrobin.com/users/Juno16/
- AstroBee Online
- Moderator
- Articles: 0
- Posts: 2362
- Joined: Thu Nov 14, 2019 11:03 pm
- 4
- Location: Henderson, NV
- Status:
Online
-
TSS Awards Badges
TSS Photo of the Day
Re: How to despeckle in PI?
1. No Darks, Bias, DarkFlats
2. Darks only
3. Darks and Bias
4. Darks and Dark Flats.
I'm putting my money on #4 by a landslide.
Everybody else can't be wrong.
Scopes: Celestron EdgeHD14", Explore Scientific ED152CF & ED127 APO's, StellarVue SV70T, Classic Orange-Tube C-8, Lunt 80mm Ha double-stack solar scope.
Mounts: Astro-Physics Mach One, iOptron CEM70EC Mount, iOptron ZEQ25 Mount.
Cameras: ZWO ASI2600mm Pro, ZWO 2600MC Pro, ZWO ASI1600mm
Filters: 36mm Chroma LRGB & 3nm Ha, OIII, SII, L-Pro, L-eXtreme
Eyepieces: 27mm TeleVue Panoptic, 4mm TeleVue Radian, Explore Scientific 82° 30mm, 6.7mm , Baader 13mm Hyperion, Explore Scientific 70° 10mm, 15mm, 20mm, Meade 8.8mm UWA
Software: N.I.N.A., SharpCapPro, PixInsight, PhotoShop CC, Phd2, Stellarium
https://www.nevadadesertskies.com
- DEnc
- Articles: 0
- Posts: 287
- Joined: Tue Aug 13, 2019 11:52 pm
- 4
- Location: Northern CA
- Status:
Offline
-
TSS Photo of the Day
Re: How to despeckle in PI?
Thank you for this! Post #20 was very interesting.Juno16 wrote: ↑Sun Aug 20, 2023 3:00 am ...I submitted a thread to the PI forum.
https://pixinsight.com/forum/index.php? ... sue.16560/
Off topic, now that I'm under heavily clouded skies of northern coastal California I've pivoted from astrophotography with a monochrome camera to daytime
Create an account or sign in to join the discussion
You need to be a member in order to post a reply
Create an account
Not a member? register to join our community
Members can start their own topics & subscribe to topics
It’s free and only takes a minute