Chroma Vs Saturation: Color Theory for AstroImagers
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- Опубліковано 9 лют 2025
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Time for a little color theory. What the heck even is Chroma or Saturation. How does it affect our astro images? Should you be using one or the other? Never thought about it and now you are really curious for no reason? This is the video for you!
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I'm embarrassed to say, I've been a commercial photographer for over forty years and never knew this. As you said Frank, I thought I knew what saturation did so just reached for that tool all the time. Thanks for all these enlightening videos!
This is one of your best videos yet. Outstanding explanations! Thank you.
I'm glad you liked it! I worked hard on trying to really explain this concept best I could. Never know if what you want to come across actually is going to :)
02:29 😂 This is great and really appreciated Frank!
Cheers!
Doug
I really appreciate you interpreting that foreign language into something I can understand I really appreciate all your hard work this is a game changer for a beginner like me thank you
Hi Frank. ABSOLUTELY the very best description between the two ! Now I understand. TU !
Thanks for explaining. I just found out that I should fiddle around more with chroma than with saturation...in most cases.
Keep up your good work 🙂
Wow, thanks Frank, exactly as you describe, I've been using Saturation because it was the tool I knew, or should I say thought I knew. Turns out I've been using the wrong tool most if not all the time. Very easy to understand clarification and I'll definitely be working in Chroma moving forward. Between this and the latest updates, I sent another donation. Really appreciate all the great content and tools.
@@amateurastrophoto3057 thanks a bunch! I really appreciate it!!
Thanks for an excellent explanation and demonstration. I knew there was a difference between the two, I thought I understood the difference, but I didn’t. This clears up so much that I was unsure about.
Very clear explanations! Thanks a lot !
Excellent explanation.. thanks
Thanks for clearing up something I've been trying to understand better for months and casually adding a tool. Awesome info thanks
Thanks for sharing this video, and for everything you do for the astro community. Other than color calibration, I do all of my color work in Photoshop, so I do have a different perspective. I do have some different thoughts on the topic. First, the behavior of increasing/decreasing saturation is also dependent on the color model, and possibly the rendering intent. The effect you demonstrated with the Munsell chart works in Lab, but desaturating in an RGB color mode results in variations in luminosity; in Lab color mode it shows the effect of the same luminosity. I'd also say that my goal in processing my images is to bring out differences so that things that are different are also visually different. I use both contrast and color contrast to accomplish that goal; if increasing or decreasing saturation also affects luminosity, and it helps with the differentiation I want, then I'm OK with that. I do generally strive for a saturation balance so that one color doesn't dominate. I do believe PixInsight is operating internally in an Lab color mode and simply translating to RGB for display as opposed to working natively in RGB values. Lastly, when I applied desaturation effects to your sample image in Photoshop (or in PixInsight) it did not saturate the core region, so I wonder if there's a difference between your color math and that applied by PixInsight and Photoshop. Thanks again for the video, the more we understand about the tools the better we can use them to bring our vision to life.
“What are we doing here?!” I’m going to start using that at the office. 😂
Great video with very valuable information as always
Excellent tutorial and demonstration Franklin. Thank you!
Thanks very much. Very good example.
Fantastic myth clarification, your app sample is great visualization to understand and validate how this works, lately I was using Chroma after seeing your results in some processing demos, now I understand why some results, thanks
I learned a lot from this video. I didn't understand what saturation did before watching.
Really good, thanks! You've managed to explain something I didn't know that I didn't know. Nice :-)
I had no idea that chroma was a concept! Thanks for another great video and I will definitely try chroma out in the future
Very concise and excellent explanation! Thank you!
Excellent explanation
Live and learn. I never understood the value of chroma, your video will change the way I process images. Thank you Frank for the valued insight!!!
Learnt something today 👍🏻👍🏻
Very useful, thank you!
Compliments on another highly informative video.
Great Video !👍
What a fantastic video, seeing the side-by-side really gets the point across, where you can _see_ the difference. Question for you: When (if ever) would you choose to change saturation instead of chroma? I see your suggestion for chroma as the primary tool in most astro photos, but what niche scenarios might you choose to decrease the brightness via saturation? Curious if Orion with it's bright core acts as an example?
Stars. Boosting star color in your stars only image is a great example of needing saturation. There is only so much color you can have woth them so bright. If you want to use it on really bright nebula that is your decision too. More color or keep the brightness. That is the trade off
This is incredible. The most I’ve learned in a long time. I’d love to see what ways you’d use for adjusting chroma in photoshop.
I think in PS they call it vibrance, but you may have to look that up
You may also need to convert the color profile to LAB in photoshop. PS just wasnt designed for more scientific work in LAB i dont think
Hi Frank. I appreciate your good contributions to this community. This is another great thing to learn. I have one question. Regarding the curves boost in your Statistical Stretch, the curve is boosting saturation or chroma? Thanks
Neither. Brightness. Also known as the K value. it sets an anchor point at 1/2 the median and another at the median then uses curves to raise up brighter parts than that
Hiya Frank . Great Video . Learned something new today . Question , is that your microphone , in your insert , that is flashing ? Just curious .
Yeah stupid cutout. I tried messing eith the feather and stuff. Ill do better next time
Oh yes! Do a video on RGB colors in a pic and the representation on a screen!!!
Like a video on monitor color gamut? Oof that would be a tough one
When you’re too early to scroll comments while you watch 🥲
heck of a thumbnail!!
I could not get the WIN executable to download for the DEMO.
Huh, shoot me an email and we can try getting the link working
This is very helpful. Perhaps run through an example, say, M42...
Watch all my tutorials, i use chrominance when boosting color. Instead of clicking the S for saturation, click C and use that in the same manner
That's gonna take a while to absorb. I just tried it o one of my images and it turned the nice orange bits into green!
Shouldnt do that. What program are you in?
Thanks for this good explanation. I will change my habits. I think the answer of your question is Pix. I don't see how to remove colour with C or a an b. When you move the curve, you can add blue or yellow or green and red. I use the C curve to the bottom to increase colour. Do you mean we need to increase the curve to go to the grey side? (I'm on my phone without Pix to check 😅
Just use the C. If you raise it you raise chrimance if you lower C you lower chrominance. Treat C how you would saturation with S
Thank you for your explanations, but in concrete terms, what is the process for adjusting the chroma?
What program do you have?
If you have PI use the chroma curve and pull ot up like you would the saturation curve.
@@setiv2 yes, il have PI. Do you Mean "Transformation curves"?
@@setiv2are there good ways to do without PI? Man, I'd love a feature for the Setiastro suite! :)
@meloney now that is an idea! Just chroma are a full curves tool? Not even sure I can do a full curves tool so no promises lol
SO. that's what that button does. Thanks.
PI needs some color tools with sliders like Lightroom and PS
@@keithhanssen7413 curves works and has a realtime preview. For color PI seems just fine
@@setiv2I prefer to lighten individual colors by themselves. I can’t figure how to do that in PI.
@keithhanssen7413 click tge R G or G to adjust them seperately either in curves or histogram
@ having all of the colors and adjustments with sliders like how it is in LR or PI gives much more control. I’ll give your suggestion a try. I usually finish in Lightroom because of the color controls (luminosity and saturation). Lately I have been using different controls such as chrominance instead of saturation and I’m liking the results better than saturation alone. Thanks for the tips! Clear skies.
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Very clear and useful explanation - thanks very much!