Processing Astrophotography Images: Color Cast and Color Noise and how to minimize it

A.V.Astronomy

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In this video I demonstrate the techniques I use in Photoshop to reduce or eliminate off colors / color noise that comes from using filters, noisy cameras, or noisy data in your astrophotography images.
My Link Tree - linktr.ee/avastronomy
Links to my other videos that explain layer masks, camera settings, Collimation and image processing in more detail.
• How to process Astroph...
HLVG - www.deepskycolors.com/archive...
Gradient Xterminator - www.rc-astro.com/resources/Gr...
OPT telescopes and Agena Astro have a tremendous inventory of astrophotography gear and great service. You can check them out here through my affiliate links. This is the setup I currently use.
Agena Astro - bit.ly/3D3U8id
ASI AIR PLUS - bit.ly/46BTfej
IOPTRON GEM 28 MOUNT - bit.ly/3O2QpGX
WILLIAM OPTICS Z61 - bit.ly/44v5Hv7
IOPTRON IGUIDER - bit.ly/44AXRzv
ASI 294MM CAMERA KIT - bit.ly/46Clqd3
Links to helpful astrophotography items that can be purchased directly through Agena Astro.
TELESCOPES
Redcat71 APO telescope - bit.ly/3D6cT4s
Sky Watcher 8" Dobsonian reflector telescope - bit.ly/3XGYwNy
ASTRONOMY CAMERAS
QHY 600M - bit.ly/3rbHgno
ZWO ASI533MC Pro OSC camera - bit.ly/3XPlzpx
ZWO ASI2600MC pro camera - bit.ly/3pDJFHg
MOUNTS
ZWO AM5 Mount - bit.ly/44eHUzn
Sky Watcher Star Adventurer 2i Pro pack - bit.ly/44gXXMV
Sky Watcher EQ6 R pro mount - bit.ly/3riYbVc
Sky Watcher EQ8 (for heavier payloads) mount - bit.ly/3D3UFkd
Celestron CGXL mount - bit.ly/3O2u6lQ
FILTERS
Optolong Luminance Pro (broadband light pollution filter) - bit.ly/46FIdEJ
Optolong L-extreme(vary tight/narrow dual band light pollution filter) - bit.ly/3NLwrjJ
Optolong L Ultimate - bit.ly/3NIHABV

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Опубликовано:

17 июл 2024

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Комментарии : 55

@talhazia1401 Год назад

My new go-to astro-processing yt channel 👍👏

@-Jantje 2 года назад

Oh man, where have you been all this time - thank you so much for this tip - so happy now. 👍👍👍👍👍

@kerrykennedy6398 3 года назад

Using the Filter>Average >Subtract method to white balance the image: Mind blown. Thanks for the new editing technique!

@AVAstronomy 3 года назад

You’re welcome! Clear skies and God bless!

@michal_king478 2 года назад

yeah thats really game changing for me. my images are full of whacky colors and gradients from a noisy camera and a ton of lightpollution and lamps around my balcony

@flintandsteelpro 3 года назад

I am shocked on how great and useful your content is. Keep it up man!

@AVAstronomy 3 года назад

Thank you sir! New videos coming soon!

@yervantparnagian5999 3 года назад

Another great video. Thanks a bunch. So glad I found your channel.

@AVAstronomy 3 года назад

Thank you! Glad you find it helpful! God bless.

@Mr77pro 3 года назад

Excellent tips! Thanks so much and love your channel!!

@AVAstronomy 3 года назад

Thank you!!

@llamarvasquez1803 3 года назад

Man this is awesome! Thanks for this kick ass image 🔭📸

@AVAstronomy 3 года назад

Thank you!!

@avt_astro206 3 года назад

Excellent Tutorial Aaron. Beautiful Capture Of The Witches Head Nebula and The Bright Star Rigel. Keep It Up 👍👍

@AVAstronomy 3 года назад

Thank you!!

@Handles-R-Lame 3 года назад

Man, out of all the Astrophotographers here on youtube, you sir are KING of photoshop! Ive learned more on this channel than any other! I hope that RC is coming along nice, i know how finicky they can be as i have the iOptron RC6 and dont dare try imaging any DSO's until i get my guiding down to the T. Until then i will just continue imaging with my SW Evostar 80ED and GSO 6" imaging newtonian... lmao much more forgiving.. Clear Skies!

@AVAstronomy 3 года назад

Gee, thank you sir! Glad to hear you’ve learned so much on my channel. And yes, the RC is coming along nicely. As finicky as it is, I do enjoy imaging with it. Clear skies and God bless!

@zubruu 3 года назад

Will test it! thanks!

@AVAstronomy 3 года назад

You’re welcome!

@Ryan-ct1oc 2 года назад

This video along with "make those clouds pop" for North American Nebula helped me a ton for processing my exposure shots - thank you!

@AVAstronomy 2 года назад

Awesome. Glad it helped you out. Clear skies!

@Tihpem 3 года назад

Now that was a good amount of things to try out what I have never attempted, great stuff! Would be awsome to have someone like you to look over my shoulder as I attempt to process a image and receive this practical lesson. Been using PS now less than a year and it can be rather taunting and confusing.

@AVAstronomy 3 года назад

Thanks for watching! Glad you found it helpful!

@domino089 3 года назад

I love the mess behind you 😃 That you are not trying to look perfect. Thumbs up.

@AVAstronomy 3 года назад

😂. Yeah, 3 kids and 2 jobs keeps a dude busy lol! One of these days I’ll make it look a little more professional. Thanks for watching!

@lachezarkrastev7123 3 года назад

Good tutorial.

@AVAstronomy 3 года назад

Thank you!!

@suzannebeers6238 2 года назад

Thanks for another great processing video Aaron! You touch on everything I need to learn - I so appreciate it! Could you (or have you already) create a tutorial on how to stitch together mosaic tiles? I'm finally figuring out SGP and it's mosaic creation feature, but I have no idea how to stitch the tiles together into a single image.

@AVAstronomy 2 года назад

You’re welcome Suzanne. Wish I could help you with SGP but I use APT. Clear skies!

@timvaucher 3 года назад

Nice video! Btw, a way I do to avoid stacking artifacts from multiple session is to load, plate solve and sync my mount with the first nights results. I mean, you still loose the few pixels on the edges due to dithering but that's all I need to crop. Also, to get rid off unwanted green noise, I don't know if you're familiar with the (free) plugin called "Hasta la Vista Green" (HLVG) it does a pretty nice job at removing green noise in DSLR images. Keep up the good work and clear skies

@AVAstronomy 3 года назад

That’s awesome Tim, thanks for the tip. I’ll definitely be checking out that plug-in. 👍

@projectelrond1817 Год назад

this is outstanding, so good i think you should redo the audio, that feedback is distracting from really good content.

@theastrophotographerjudah9421 2 года назад

What exactly did you do to the layer at 1:48? Whenever I would make a layer, it would always be transparrent

@jean-marclemoine9636 3 года назад

Hi. I think the opposite of green is magenta. Anyway nice video and thank’s for sharing. Clear skies. JM.

@AVAstronomy 3 года назад

Yeah I couldn’t remember off the top of my head 😂. Thank you!

@timvaucher 3 года назад

@@AVAstronomy Btw a tip to remember the opposites of RGB is to take the subtractive color model CMYK (same as a printer) and you get the pairs (Red, Cyan), (Green, Magenta) and (Blue, Yellow) 😉

@northtexasskies7786 2 года назад

My photos always turn yellow when stretching they used to turn magenta but now they turn yellow. Idk why. I haven't changed anything. I only have DSS and Gimp so I'll have to find a way to work around this stuff. I don't think Gimp has an average mode for the blur filter.

@johnnyredfireastroimaging5266 3 года назад

How did you learn this stuff? I use your techniques in all my images!

@AVAstronomy 3 года назад

Awesome! I’ve been tinkering with photoshop for 15+ years and have watched a lot of different tutorials over the years. Despite that, there’s still a lot left to learn in photoshop. Clear skies amd God bless!

@pemongillo 3 года назад

Are the Arc Sin stretches you have loaded into curves of your making or is it a download?

@AVAstronomy 3 года назад

They are a download from cloudy nights forums

@pemongillo 3 года назад

Yes I downloaded them . Thanks

@GrowingAnswers 3 года назад

I was playing around with some processing recently. I found that with my canon 70d, if I only use flat and light frames I get a good result but I see some walking noise. If I only stack light frames I get a good result with some extra work and I have no walking noise. It seems to be a trade off. Do you know of any reason why I see more walking noise due to flat frames and is there a setting in DSS that manages that?

@AVAstronomy 3 года назад

That walking noise you’re talking about, from what I understand, is a combination of drift in polar alignment and pattern noise from the camera. I’m not sure about its correlation with calibration frames. Do you use random dithering in your imaging? And how accurate is your Polar alignment? Those two factors may help improve your situation, although it is possible A newer camera with less pattern noise could help reduce this problem. Hope that helps clear skies and God bless!

@GrowingAnswers 3 года назад

@@AVAstronomy the only dithering I get is from the natural jogging back and forth of my skyguider pro. If I just stack light frames, the noise is very uniform and relatively smooth. If I add flats then I’ll see walking noise. By walking noise I mean some faint pattern lines in the noise. The lines are not made of color noise. It’s just darker pixels. It’s not bad, but it’s there and I wasn’t sure if there is something In dss that would change that.

@AVAstronomy 3 года назад

@@GrowingAnswers I wish I had a more definitive answer for you on that. I suppose it’s possible to change some of your stacking settings and DSS and see if that helps illuminate the problem but honestly not sure where to start on that. I have found, however, that Astro pixel processor sometimes stacks images better Dan DSS does and vice versa. You might want to give that a shot as well if do you have that program.

@GrowingAnswers 3 года назад

@@AVAstronomy ok thanks!

@GrowingAnswers 3 года назад

@@AVAstronomy after some extensive processing of the same image over and over, I found that the worst flat frame stacking method is "maximum." The other methods are all exactly the same in the final image. Maybe "adaptive..." has a 5% improvement over the others, but the minor walking noise is still there. Just in case you wanted to know.

@harabara9451 2 года назад

How long integration is this? Do you think I can get anything with just 2 minute exposures without filters with dslr from bortle 5? If yes, how much integration time is needed?

@AVAstronomy 2 года назад

Hi Hara, yes you can get this in bortle 5. However, it will take a lot of integration time. Plan on taking at least 8+ hours. Mine was 11.5 hours.