Highlighting Ha channel in galaxies

Software Siril
1

Hi

Is there a way to highlight the Ha channel in galaxy images?

When I use the RGB combine tool and add the Ha channel the nice red H2 regions in the galaxy image get lost in the rest of the RGB data.

Thanks!

Joe

2

You can use PixelMath tool.
Use this PixInsight tutorial to adapt it to Siril: Advanced Narrowband Combination — Night Photons

3

I suggest this: Advanced Narrowband Combination — Night Photons
(link is at the end of Siril’s tutorial that may still be helpful: Siril - RGB composition )
Good luck

4

Thanks for this link, however it seems it is written for PixInsight. What would the equivalent pixel math equation of be in Siril?

$T[0]-($T[1] - MED($T[1]))

5

T[0] means current red chanel (of the loaded image). So replace by a variable name of an image

6

Thanks

What does T1 mean?

It is a RGB image with Ha in Red and Red in G & B as described in the link you sent

Joe

7

T[1] is the same for green channel and so on.

8

Here are the RGBHa channels…

Link

Maybe a Siril guru can combine and share the result?

Thanks
Joe