How to extract CIE a

[oldwexi]

Last night i exposed the SH2-15 for 3 hours with my QHY8 One shot color camera on the Hyperstar-C14. On the stacked image
a lot of H-Alpha is visible, but very very flat without good details. (No filter used).

But, when i view the "Cie a" component only, there are very nice detailed and sharp HA-filaments visible.

So, i thougt to use the "Cie a" channel as a mask to improve the HA-details of the RGB image.
BUT, how to extract the "CIE a" channel?
Can anybody give me a hint. Thanks a lot in advance.

Gerald

[oldwexi]

Sorry for my blindnesss and the question before, just found the answer.

"Channel Extraction", it is doing what i have asked for.

Gerald

[Carlos Milovic]

BTW, I always wanted to do some research on the a channel for Ha nebulosity enhance... your experiences are highly welcome.

[oldwexi]

Hi Carlos!
Will let you know the outcome of my "Cie a" test band usage for H-
Alpha improvement.
Thanks

Gerald