Hubble Palette question...

[cloudbuster]

Hi all

please can you help?

does anyone know of a good link / guide to getting hubble palettes?

i have photoshop cc

and wish to process my ic410

i have noels action and have produced a synthetic green channel.

i just cant seem to get those classic colours!

cheers

bob

[perfrej]

This is a good starter!

http://bf-astro.com/hubbleP.htm

/per

[cloudbuster]

Thank...that's great for if I have added s2...will bookmark that one...

But I'm guessing these kind of Hubble palettes are not possible with 'synthetic green'?

Bob

[swag72]

I think to get a HST palette, you probably do need SII and a synthetic green won't cut it. But, you can do a lot with a HOO palette and the colour select tool in PS - As per the Bob Franke tutorial. Just keep adjusting the sliders until you find something you like.

[Gina]

This is a good starter!

http://bf-astro.com/hubbleP.htm

/per

That's what I use - works fine

[perfrej]

Hubble is implicitly S2 for red, Ha for green and O3 for blue. If you do not have all three, S2, Ha and O3, your're looking at bicolour, which entails using a synthetic green.

/per

[Gina]

For bi-colour I use HOO or more usually adding 25% Ha to the OIII in the blue channel to provide "natural colour".  The 25% Ha emulates the Hydrogen Beta that is a pale blue and a quarter as strong as Ha.  Being hydrogen it is in exactly the same places as the Ha.

Ha is a deep red and OIII is turquoise - roughly midway between green and blue.

[cloudbuster]

Thanks guys and gals. It all makes sense now, and I was barking up the wrong tree all along!

I did come up with a pleasing looking image, which I will post later.

Many thanks

Bob

[FraserClarke]

25% Ha emulates the Hydrogen Beta that is a pale blue and a quarter as strong as Ha.  Being hydrogen it is in exactly the same places as the Ha.

That's not quite true. H-beta is absorbed more by dust that H-alpha, so the H-beta/H-alpha ratio is traces how dust is distributed throughout an object.