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Useful Gimp tutorial for LRGB processing

Last post by SkyHiker « Mon Mar 28, 2022 3:01 am

by SkyHiker » Mon Mar 28, 2022 3:01 am

I ran into this YouTube tutorial for LRGB processing in Gimp while looking for how to process the luminance properly. I thought it was useful and a...

0 Replies

797 Views

Last post by SkyHiker
Mon Mar 28, 2022 3:01 am
Flats for all of LRGB or just L?

Last post by Stuart « Sun Mar 27, 2022 4:55 pm
Replies: 21
by SkyHiker » Mon Jan 24, 2022 4:03 pm
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First post

Howdy, last night my object was NGC2170 in LRGB. I normally take flats and biases in L only. That usually works but this time my stacked colors...

Last post

Alright then. Whatever works for you.
21 Replies

14855 Views

Last post by Stuart
Sun Mar 27, 2022 4:55 pm
What happens if...

Last post by STEVE333 « Mon Mar 21, 2022 11:12 pm
Replies: 29
by UlteriorModem » Thu Mar 17, 2022 9:10 pm
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2
First post

Still trying to configure the new computers.

Got a real issue with my calibration files not working with the lights.

What happens if your gain and...

Last post

Tom - do you see the blemish on the individual frames or is it something introduced during calibration?

Steve
29 Replies

3416 Views

Last post by STEVE333
Mon Mar 21, 2022 11:12 pm
Removing Background Mottle with PixInsight

Last post by STEVE333 « Fri Mar 04, 2022 4:28 pm
Replies: 4
by STEVE333 » Tue Mar 01, 2022 8:38 pm

First post

The following shows how to use PixelMath to remove MOTTLE from an image. Unfortunately I don't remember who came up with this PixelMath approach,...

Last post

One additional point. The icon I provided is setup to work on an RGB image. If you want to apply it to a monochrome image (like a Luminance image)...

4 Replies

1429 Views

Last post by STEVE333
Fri Mar 04, 2022 4:28 pm
What causes this?

Last post by Larry 1969 « Sun Feb 27, 2022 9:18 pm
Replies: 7
by Larry 1969 » Tue Feb 22, 2022 2:09 am

First post

Every single time I try to image M78 I get this weird artifact. It's happened several times over the past 2 years with different cameras.
Some of...

Last post

You might want to look at an arts & crafts supply type store for a sheet of black abs plastic. You may need to get a different color and paint it...

7 Replies

1347 Views

Last post by Larry 1969
Sun Feb 27, 2022 9:18 pm
Yet another flats question...

Last post by JayTee « Sun Feb 20, 2022 1:12 am
Replies: 27
by Larry 1969 » Thu Feb 03, 2022 11:29 pm
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2
First post

Sorry if I seem to be asking the same question over and over again...
I'm going to try to be very specific and detailed about the situation.
I had a...

Last post

I would not have thought of Loctite as a solution. Thanks for this post.
27 Replies

8525 Views

Last post by JayTee
Sun Feb 20, 2022 1:12 am
Flats???

Last post by XCalRocketMan « Fri Jan 28, 2022 1:37 am
Replies: 8
by Larry 1969 » Sat Jan 22, 2022 7:18 pm

First post

Good day all!
I've been struggling terribly trying to get my flats to correct my vignetting properly...
I use a Pegasus Flat Panel and APT's Flats...

Last post

I use a LED flat panel on top of my OTA but I place anywhere from 3 to 6 sheets of paper to diffuse and dim the light a bit. Works great. And, I've...

8 Replies

2496 Views

Last post by XCalRocketMan
Fri Jan 28, 2022 1:37 am
Well, astrophotography the modern way with computers and software is somewhat more difficult than expected.

Last post by OzEclipse « Wed Jan 19, 2022 10:26 pm
Replies: 25
by cumbrianwolf » Thu Jan 13, 2022 11:48 am
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First post

Well I have not posted for a little while after seeking some advice from you all on here and of course building up my kit with said advice, oh and...

Last post

Grade 7 or 8 both high enough tensile strength for holding that sort of weight. Some of the cheap galvanised bolts sold in discount hardware seem...
25 Replies

14698 Views

Last post by OzEclipse
Wed Jan 19, 2022 10:26 pm
New AP processing Challenge Open

Last post by Jockinireland « Tue Jan 18, 2022 4:55 pm

by Jockinireland » Tue Jan 18, 2022 4:55 pm

A Galaxy challenge to get ready for Galaxy Season

Head over to

0 Replies

928 Views

Last post by Jockinireland
Tue Jan 18, 2022 4:55 pm
How to Keep the stars looking like they are supposed to look, help!

Last post by chris_g « Thu Jan 13, 2022 5:43 am
Replies: 10
by chris_g » Mon Jan 10, 2022 12:18 am

First post

Hello all,

Looking for some guidance on how to tame stars in Photoshop. I have about 8 hours of data on NGC 1893. I want the stars to look like the...

Last post

Sky , Thank you! Exactly what I was looking for, you are awesome!

10 Replies

3733 Views

Last post by chris_g
Thu Jan 13, 2022 5:43 am
Noise Reduction - Jon Rista Technique

Last post by starfield « Tue Jan 11, 2022 3:59 pm

by starfield » Tue Jan 11, 2022 3:59 pm

Came across the video on the TAIC last night on a PI noise reduction method. Jon Talbot walks thru the process documented on Jon Rista's website. I...

0 Replies

1180 Views

Last post by starfield
Tue Jan 11, 2022 3:59 pm
Creating, Editing, Saving and Loading PixInsight Process Icons: Part 2

Last post by STEVE333 « Wed Jan 05, 2022 11:59 pm

by STEVE333 » Wed Jan 05, 2022 11:59 pm

The link below is to Part 2 of the PixInsight Icons tutorial. It has a few additional tips.

Hope it helps.

Steve

0 Replies

1580 Views

Last post by STEVE333
Wed Jan 05, 2022 11:59 pm
Creating, Editing, Saving and Loading PixInsight Process Icons: Part 1

Last post by STEVE333 « Wed Jan 05, 2022 4:08 pm
Replies: 2
by STEVE333 » Wed Jan 05, 2022 3:59 am

First post

The link below is to a tutorial that shows how to Create, Edit, Save and Load PixInsight Process Icons. This was the single biggest step in my...

Last post

Steve, just what I needed, thank you! Great explanation, it really is very simple following your instructions.
Kerry

Glad it helped Kerry. Have...

2 Replies

1820 Views

Last post by STEVE333
Wed Jan 05, 2022 4:08 pm
Quick Registax question

Last post by Ylem « Wed Jan 05, 2022 1:56 am
Replies: 5
by Ylem » Tue Jan 04, 2022 11:53 pm

First post

I just downloaded and opened up my first image taken with my new Orion Starshoot USB camera.

The problem I am having is saving it (it's an AVI...

Last post

Got it!
Lovely CA!
1641346926541_1641346920748_catree.jpg

5 Replies

2325 Views

Last post by Ylem
Wed Jan 05, 2022 1:56 am
Low color in DSS

Last post by Gordon « Fri Dec 31, 2021 6:52 pm
Replies: 1
by Ricbrekne » Fri Dec 31, 2021 10:04 am

First post

Hi. I find that DSS produces final stacked images that just dont have enough color for post processing in PS or Gimp unless I push the colour...

Last post

It appear you are using a color camera.

Make your you have this box checked in DSS.

Its located in the Options / Settings / Raw/FITS/DDP...

1 Replies

1714 Views

Last post by Gordon
Fri Dec 31, 2021 6:52 pm
Wiz reprocess

Last post by KathyNS « Fri Dec 31, 2021 3:07 pm
Replies: 2
by SkyHiker » Fri Dec 31, 2021 3:48 am

First post

With my newly gained Gimp and StarNet++ tricks I decided to give the Wiz another shot. Same data as before, from a couple months ago. I have to say...

Last post

Very nice, crisp reprocess!

2 Replies

1741 Views

Last post by KathyNS
Fri Dec 31, 2021 3:07 pm
Image is “Gray” after stacking in DSS

Last post by Ricbrekne « Fri Dec 31, 2021 9:54 am
Replies: 5
by Kerry C. » Sat Jan 16, 2021 10:41 pm

First post

I have taken my first images with my new set-up using my ASI294MC Pro. They were taken using the RAW setting in APT (Astro Photography Tool) then...

Last post

How does one debayer before stacking in DSS ?

5 Replies

3389 Views

Last post by Ricbrekne
Fri Dec 31, 2021 9:54 am
The effect of resolution on StarNet++

Last post by STEVE333 « Wed Dec 29, 2021 5:33 pm
Replies: 3
by SkyHiker » Wed Dec 29, 2021 9:00 am

First post

For those using Starnet++, I found that the results can be dramatically different depending on what resolution is used. I had a NB image of the...

Last post

Nice comparison Henk -

Even though Starnet leaves artifacts of big stars those artifacts often disappear when the stars are added back in.

If the...

3 Replies

2348 Views

Last post by STEVE333
Wed Dec 29, 2021 5:33 pm
Crazy Lunar Processing 200,000 image set

Last post by messier 111 « Wed Dec 22, 2021 1:36 am
Replies: 2
by John Donne » Tue Dec 21, 2021 2:41 pm

First post

This was very interesting to me.

Last post

amazing , thx .

2 Replies

2502 Views

Last post by messier 111
Wed Dec 22, 2021 1:36 am
Looking Deep into NGC1499 using NINA

Last post by Juno16 « Tue Dec 21, 2021 11:39 pm
Replies: 9
by umasscrew39 » Thu Dec 16, 2021 12:59 pm

First post

This is actually a topic on image acquisition, but I was not sure where else to place it. So, I hope that is ok to place it here.

I took this...

Last post

Hi Star Dad,

A flat line or saw tooth plot could be a sign of backlash.
Of course, all gear drive systems have some degree on backlash. It can be...

9 Replies

4368 Views

Last post by Juno16
Tue Dec 21, 2021 11:39 pm
New AP Processing Challenge Open

Last post by Jockinireland « Sat Dec 11, 2021 5:15 pm

by Jockinireland » Sat Dec 11, 2021 5:15 pm

This months AP processing challenge is now open at

Head over and take a look.

0 Replies

1940 Views

Last post by Jockinireland
Sat Dec 11, 2021 5:15 pm
Reverse vignetting?

Last post by yobbo89 « Thu Dec 09, 2021 12:46 pm
Replies: 29
by Larry 1969 » Wed Dec 01, 2021 12:31 am
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2
First post

I'm not even sure there is such a thing but I've been having trouble getting my flats to correct properly. The trouble seems random.
Some of my...

Last post

Thanks for all the replies and suggestions. I get so few clear nights to test anything out. I was able to get out for a few hours this past weekend...
29 Replies

13441 Views

Last post by yobbo89
Thu Dec 09, 2021 12:46 pm
Horses head nebula???

Last post by Graeme1858 « Wed Dec 08, 2021 5:27 pm
Replies: 2
by Mirrorgirl » Wed Dec 08, 2021 10:31 am

First post

Hi there
Could someone please help me with the horse's head I don't know if I'm at the right end or not here's the image thanks guys...

Last post

Hello Rhoda

Jim's annotated image shows that you're looking at the star in Orion's belt to the right, Mintaka. The Horsehead Nebula is near the star...

2 Replies

2296 Views

Last post by Graeme1858
Wed Dec 08, 2021 5:27 pm
Newb question - Which stretch and how much?

Last post by pakarinen « Tue Nov 30, 2021 5:41 pm
Replies: 3
by pakarinen » Mon Nov 29, 2021 6:40 pm

First post

How do you choose which stretch function to use and how much stretching should one do? Using JS9 for example, there's a choice of linear, log, asinh,...

Last post

Hi Wassan - Which image processing software are you using?

Steve

I've only played with JS9 so far. I do have a copy of FITS Liberator, but...

3 Replies

2236 Views

Last post by pakarinen
Tue Nov 30, 2021 5:41 pm
Newb question - RAW stacking with DSS?

Last post by SkyHiker « Wed Nov 24, 2021 9:53 pm
Replies: 3
by pakarinen » Wed Nov 24, 2021 8:19 pm

First post

I was playing with DSS, JS9, and Photopea and some LRGB files from SLOOH. I don't have a bunch of files to stack, but DSS looks like a clean,...

Last post

You can do light editing in DSS that gets you 90% of the way.

1) Broaden the RGB curves as much as possible to the same width using the left...

3 Replies

2248 Views

Last post by SkyHiker
Wed Nov 24, 2021 9:53 pm

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