Creating SHO Pallette from OSC images

[Steve Haythornthwaite]

Hello and thanks for having me here.

My query is a little involved but I will do my best. I have seen in SGL a user member who converts his colour images taken using HA/OIII filters and a OSC camera to channel images (R,G,B,L), aligns them to a chemical channel within I think pixinsight that utilises the SHO pallette. EG R = hydrogen, G&B =Sulphur and L=Oxygen then recombines the image to give a pseudo colour image. Actually not sure if he does use luminance, might just be RGB.

I have already split down an image using another programme but I would like to have a way to do it all within one programme.

I guess what I want to know is that astap appears to have the facility to do similar or the same but as a complete newbie to this type of image processing I need the idiots guide please.

cheers for any help

steve

[Steve Haythornthwaite]

Oh and sorry about the name, seems W11 autofilled the name even after I changed it to Steve and put my wife's name in. It's actually steve, or twas last I looked!

EDIIT, found it can be altered in settings!

[han.k]

Hi Steve,

For luminance often H-alpha is used. I doubt OIII is strong enough for luminance.

Combining OSC image with an other camera is difficult due the difference in pixel size. ASTAP will select the lowest image as reference so the higher resolution will fill all pixel of the lower resolution. But this is very seldom used and maybe tested only once.

To combine R+G, you have to split the OSC in three colours and stack R & G as mono. The result you could give a filter name as Sulfur. Then you could combine the H-Alpha series, Sulfur series and O3 series. This you could combine as RGB or LRGB using H-alpha as L.

How good this work I don't know. It is years ago I tried to combine images made using filters and OSC. If you have the three intermediate results or the OSC , H-Alpha and OIII stack, I can have a look here as an experiment.

Cheers, Han

[Martin Dowd]

Hi Steve,
Im assuming your trying to use OSC data captured using a Dualband filter ( Ha and Oiii ) and trying to process an SHO type pallete ??
If so , Startools can do this for you via its Compose module without complicated channel separation and blending like Pi and other programs. Being OSC unfortunately the results will never be as good as using Mono with dedicated narrowband filters but it can be done. It requires a lot of good data.
Ive had good results from most of the brighter emission nebula which exhibit plenty of Ha and Oiii signal. Sii signal is normally very weak anyway , even from a OSC Triband filter .
Just stack your data set as normal in ASTAP
In Compose module choose Luminance type Select Luminance Colour - L+Synthetic L from R (2xG ) B, R ( GB) (GB) ( Bi Colour from OSC DSLR )
Load your stacked OSC Dualband data set into the following channels (R / Sii ) ( G /Ha ) and ( B/ Oiii ) and once set , Startools will create a synthetic luminance to process your data all the way to the Color module where you can select numerous SHO , HOO , OHO and interpolated Colour matrixes with plenty of color , brightness and saturation adjustments to taste

https://www.startools.org/modules/composite
https://www.startools.org/modules/color

Hope this is what your after , if not its another processing option for OSC data sets

Cheers
Martin