vdb142 - narrowband - have a try

[TeeJay]

Hi Herbert,

I can explain you the steps if you like. But i'd like to do this in Skype, as I am from Switzerland we can speak german.
You can write me at astro(ät)teejay.ch

CS
TeeJay

[Lex]

...Vicent not Vincent 

[TeeJay]

I published the same workflow on another image here: link.

CS
TeeJay

[Herbert_W]

...Vicent not Vincent 

uups - sorry!

@TeeJay!

I published the same workflow on another image here: link.

Thank you for this additionel info - now I have to study a lot ;-)

Best regards.
Herbert, Austria

[astropixel]

Well First attempt at narrow band

Registered and ChannelCombination SII, HA, 0III. Colour calibration, HT luminance mask, HMT, LRGBCombination L*, ColourSaturation, HMT, ATWT, LocalHistogramEqualisation, Deconvolotion, CurvesTransformation.

[Lex]

Well First attempt at narrow band

Nice attempt I think!

Congrats!

[astropixel]

2nd try. Is this approaching something like it. Hubble pallet I apologize in advance.

Registration
ColourCalibration - not sure if this is necessary?
Stretch, Multiscale transform, saturate, curves and noise reduction

Combined as follows;

0.8*SII + 0.2*Ha
0.2*Ha + 0.8*OIII
OIII

Thanks Juan - http://pixinsight.com/forum/index.php?topic=3734.msg25646#msg25646

[astropixel]

Had another go at this. I think this is the correct result. I'm not sure where I went wrong with the previous image.

[Lex]

Hi Astropixel,

The only thing that is IMHO not as it "should be" is the star coloring, for me it is to greenish, try  some SCNR to green or perhaps tighten the green channel with curves...
NB images always tend to result in some unnatural star colors..

Best

[astropixel]

Something like this?

[Lex]

Absolutely, this one is really nice!
When you create a starmask and invert it to protect the background you will be able to "whiten" up the stars even more!

Nice

[mcbbcn]

Hi,

As I'm learning about bi-color combination, I took your Ha & OIII and apply the Cannistra method...now, I intend to figure out how to do it in Pixinsight...but this is the result so far using PS...more to come...

By the way, I know it's overstretch, but I was more interested to see the color balance outcome...

Cheers,

M.

[starhopper]

Hello Herbert,

On the one side is the mixture of the channels with pixelmath

sorry I must say, I have no solution. To say it in clear words, we all need somebody who provides a mechanism to imitate Photoshops "selective colors".

My workflow:

PI:
HistgramTransformation with STF (auto) to all channels
RGB with Pixelmath: R=SII, G= 0,85xHa, B=OIII

PS: selective Color (to get the Hubble Color Feeling) and dynamic

PI:
StarMask (Scale=8, Smoothness=7, Small=2)
MT (Morphological Selection, Iter=10, Amout=0.15, Selection=0, Sitz 5)
2x Unsharp Mask (Std=0.8, Amount=0,75x)
JPG Export

[Herbert_W]

Hi Forum, Servus Thomas!

In the meantime, I gave it up, to find a standard routine.
But new Scripts are available - see: http://pixinsight.com/forum/index.php?topic=4853.0

Maybe, these Scripts makes an end to an undless jouney in the sho-universe.
But nevertheless, Photoshops "selective colors" will be the indicator.

> Thomas: thank you for image-processing and the parameters. I never get such intensive and bright colors with PI - there is still a lot to learn!

Thank you and best regards.

Herbert, Austria

[mcbbcn]

Well, I tried to simulate the Cannistra method in Pixinsight, and I don't think it came out too bad, your thoughts are welcome...this is just a Ha & OIII combination...I was quite surprise, as you can see yellow stars, blue stars, red stars, and there is a bit a pretty good color balance...

If somebody asks me to share the method, I'll be embarrassed  because as Sanders pointed out, there is more alchemy to the Cannistra method than science...but hey, it's not too bad if you're looking for colors that a lot of people are used to see in OSC shots.

Cheers,

M.