Bi-Color Astrophotography image

[jmoore]

Has anyone used a duo narrowband filter and separated the channels in affinity photo?  I have a modded DSLR and L enhance filter and would like to make a false color image by separating and remapping the color data.  Thanks in advance for your help!

[Callum]

Hi Jmoore,

Welcome to the forums

I apologise for the delayed response to your post. Unfortunately Astrophotography isn't my area of expertise however does the following help article help with this at all?

V1 help article:
https://affinity.help/photo/en-US.lproj/index.html?page=pages/Astrophotography/astro_narrowband.html?title=Compositing narrowband astrophotography

V2 help article:
https://affinity.help/photo2/English.lproj/index.html?page=pages/Astrophotography/astro_narrowband.html?title=Compositing narrowband astrophotography

Thanks
C

[irandar]

Hi Callum. I think this does not answer the question of separating the filter bands. I have read that Siril will do it but have not been able to find anything on this subject for Affinity.

Regards Irving

[NotMyFault]

Should be quite easy.

use 2 channel mixer adjustments.

one passes red channel only,

the other passes green/blue filter only (weighted average).

then use gradient map or any other method to assign colors to the greyscale images.

can someone provide example images?

[irandar]

Where does one find the 2 channel mixer adjustments? Thanks

[NotMyFault]

5 hours ago, irandar said:

Where does one find the 2 channel mixer adjustments? Thanks

What I tried to express is you add 2 instances of the channel mixer adjustment, and adjust the settings accordingly.

This allows to mimic the "math equations" of Siril. I have no more details or tutorials about the actual formulas for users coming from Siril.