NGC 4631, The ‘Whale’ galaxy.

[RichieJarvis]

Hi Rob - I've spent the last three hours trying to get the Ha data to work

Maybe I've misunderstood - any chance of a step-by-step for a numpty??

Thanks,

Richie

[RobH]

Hello Richie.

Open up your red master and your Ha master.

Copy and paste the Ha onto the Red as a layer on top.

Set the blend mode to lighten.

Flatten the layers.

Construct your LRGB image as usual, using the Red/Ha as the red channel.

It's very straightforward....how are you trying to do it?

Cheers

Rob

[RichieJarvis]

Exactly like that - but the Ha layer set to lighten doesn't make any difference to the Red layer. Confused!

The Ha data is alot darker than the Red layer I captured - maybe thats the problem??

Cheers,

Richie

[ncjunk]

lovely image, nice detail and good to see as i haven´t looked at this myself yet.

NC

[RobH]

Exactly like that - but the Ha layer set to lighten doesn't make any difference to the Red layer. Confused!

The Ha data is alot darker than the Red layer I captured - maybe thats the problem??

Cheers,

Richie

That'll be it Richie.

You nned a good Ha image for it to work properly. You can also add the Ha with the layer blend set to 'Normal' and then adjust the opacity.

Cheers

Rob

[Aza]

Do you have to process the red and the Ha to have the same background levels?

[RobH]

That's what I normally do Arran, although if you're adding it as a 'lighten' layer, when you flatten the layers you can equalise the backgrounds to match the green and blue at that stage.

HTH

Cheers

Rob

[davo]

Simply stunning!

[Mel]

I love this image. First saw it a while back. Nice one.

And thanks for sharing useful processing tips in the same thread, that's really useful.

cheers

Iain