Continuum Subtraction in Astro Photos
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- เผยแพร่เมื่อ 23 ก.ค. 2024
- Continuum subtraction is a technique to selectively remove the continuous color that can contaminate narrowband data in astro images. It is especially useful for targets that contain a combination of both broadband and narrowband detail, such as many galaxies. This video focuses more on the when and why and less on the specific technique.
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great video i don't use PS and likely never will but i got the idea and im sure i can do some fancy pixel math to accomplish the same thing.
As always craig, wonderful demo
Great explanation, thanks for the video :)
Thank you for explaining this like I'm 5. I have been seeing a few videos about this process in my feed over the last bit, but didn't fully understand the use case for it.
wow... beautiful!!! 😮👏👏👏
Nice demo of this technique. I use pixel math in pixinsight to perform these steps but I can see where this works out better in certain situation.. especially the nebula shots like M78. Thanks for sharing.
Do you use the NBColourmapper script in PI? I’ve gone back and forth with doing CS in linear mode in PI vs stretched mode in PS and I’m liking the PS method for its ability to quickly dial in just the right amount of blending.
@@markpetersen2130 I'm not using the NBColourmapper script. I have found that I like the results of combining SHO data while linear. Sometimes I'll do a linear fit with Oiii as the reference before combining. For HaLRGB or even HaOiiiLRGB I've been using the continuum subtraction method with pixel math. After watching this video.. It looks like following this technique in PS might be better for certain types of images.
Craig, is the red continuum layer just a copy of the master red from WBPP?
Yes, but also processed by stretching and removing stars
@@utahdesertremoteobservator8328 Thanks Craig.
super demo Craig, love it