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Simulate RGB image with SHO filters

Posted: Tue Jun 08, 2021 8:21 am
by astrosatch
Hi!
Is there any way to make my SHO image to resemble RGB or OSC image? How do I blend channels to approximately get color just like those with broadband cameras? I know there is information missing to get all spectrum, but anyway.

Andrej

Re: Simulate RGB image with SHO filters

Posted: Tue Jun 08, 2021 12:51 pm
by admin
Hi Andrej,

The closest would be to;
  • create a synthetic luminance frame from S+H+O (for your detail)
  • create a red channel from (S+H)
  • then load S+H+O as L, (S+H) as R, O as G and B
This should get you the closest to what those bands would look like in the visual spectrum, while making full use of the signal you acquired

All using the Compose module of course. :)

Re: Simulate RGB image with SHO filters

Posted: Tue Jun 08, 2021 4:27 pm
by astrosatch
Thanks Ivo, that's great. :D I will try it.
Do you have any suggestion what color settings should I use in color module?

Andrej

Re: Simulate RGB image with SHO filters

Posted: Wed Jun 09, 2021 8:46 am
by admin
astrosatch wrote: Tue Jun 08, 2021 4:27 pm Thanks Ivo, that's great. :D I will try it.
Do you have any suggestion what color settings should I use in color module?

Andrej
You'd do something like this;

To create a synthetic luminance frame from S+H+O (for your detail), you would import S, H and O as R, G and B and keep the result (save this away).
Relaunch the Compose module.
To create a red channel from (S+H), load S as red, green, or blue. Do the same for H. Keep the result (save this away)
Relaunch the Compose module.
Load the SHO synthetic luminance (which you created earlier) as L, load the new red channel (S+H) you created earlier as red, load O as green and blue.
"Set Luminance, Color" to "L, RGB".
Now process as normal.

Hope that helps!

Re: Simulate RGB image with SHO filters

Posted: Thu Jun 10, 2021 5:18 pm
by astrosatch
Yes, that helps!
Thanks Ivo.

Andrej

Re: Simulate RGB image with SHO filters

Posted: Fri Jun 11, 2021 7:31 am
by Guy
Hi Ivo,

When we create the S+H+O and S+H we should set the 'Luminance, Color' to 'L + Synthetic L from RGB, Mono'
So we save the results as a mono file.
Is that right?

Guy

Re: Simulate RGB image with SHO filters

Posted: Fri Jun 11, 2021 11:42 pm
by admin
Guy wrote: Fri Jun 11, 2021 7:31 am When we create the S+H+O and S+H we should set the 'Luminance, Color' to 'L + Synthetic L from RGB, Mono'
So we save the results as a mono file.
Is that right?
Thanks Guy,

Indeed, you can do that for good measure (it is the 'proper way' of doing it and and it shows excellent comprehension of what you are doing!). Though when you save as a TIFF immediately, after 'Keep'ing and exiting the Compose module (and indicating all is still linear), then all will be mono anyway.

I should (and want to) really implement some sort of saving and/or buffering functionality inside the Compose module for this sort of thing.