Recycling old Ha data. An idea.

[ollypenrice]

Just an idea. You have lots of grand old Ha data from less expensive filters such as the 13 Nm or 7 Nm but now you have a 3 Nm (and no shirt.) You re-shoot some 3Nm data and stretch it hard, going a bit past the noise limit for the signal you have. Then you paste it on top of the old broader bandpass data, which s less contrasty, and use Blend Mode Luminosity. My thinking is that the contrastiness of the new data will apply itself to some extent to the old data. When combined you might get a reduction in noise and a good measure of the contrastiness of the 3Nm data. WIth this signal strength you could then push even harder on the local contrasts.

Could be cobblers, of course. I think I'll give it a whizz though.

Olly

[ian_bird]

Son - you're on your own!

(Blazing Saddles)

[ollypenrice]

Son - you're on your own!

(Blazing Saddles)

Nope, I reckon Sara will give this a go as well!

Olly

[swag72]

I'm happy to hunt out my old 7nm data and see what I can come up with. Not terribly scientific, but virtually all of it was taken with a different scope / camera combo. A problem?

[Gina]

Not if it covers the same area of sky.

[ollypenrice]

Agreed.

The thing is this; the 7 passes more light than the 3 so all the information in terms of light is present in the 7. What it fails to do is distinguish so clearly the darker areas. Aha, so maybe we should apply the 3 to the 7 in Blend Mode Darken?

Experiment time.

Olly