M27 - First Narrow Band (Using the GIMP!)

[Macavity]

Finally a clear night! But, instead of trying to "zap" through

twenty objects, I decided to try to narrow band image M27.

And learn how to process colour via the GIMP "properly"?

For a change found a genuinely comprehensible tutorial?

http://onsuniversum.pbworks.com/f/color_imaging_gimp.pdf

And the same with some added soothing tones (well done)!

[https://www.youtube.com/watch?v=VCYsrvxopGE]

Randomly, I chose to use my Baader UHC for "luminance".

And then added H-Alpha (Red) and 2x OIII (Blue & Green)

I wasn't terribly careful re. aligning the colour layers!

Maybe one could just add a "Cyan" layer for Blue + Green?

But I suppose you do get a more control on colour mixing.

For my final trick, I do try to try to *centre* my images using

the "move tool". Seems to help with the general impression

if presenting multiple images via slide-show or a video.

No DARK subtractions, so you are unfortunately stuck with

familiar "Mark of Zorro" red, green and blue hot pixels! 

But I think I have a better *general* idea for the future. 

[xtreemchaos]

very nice image Chris, well framed. thanks for sharing.  charl.

[Martin Meredith]

Really great detail Chris. The fainter stuff is coming through well.

BTW I happen to like the hot pixel trails as they're a kind of fingerprint for the content...

Martin

[laudropb]

Very nice image. Like the fine detail and natural looking colour. Thanks for posting.

[David Smith]

Looks good to me and the GIMP tutorials will no doubt be useful.

Thanks

[bigal1]

Great image plenty of deatil and colour in there

[nytecam]

Very impressive technique for a NB M27 - well done :-)

Nytecam

[Macavity]

Still quite a lot to discover... I see one might actually be able

to take out some of the (mercifully few) hot pixels via "BPC". 

Watec Blemish Pixel Compensation! Sounding worth a go. 

I sense I may be being a bit conservative on my use of gain

Fwiw, 20dB (about mid-scale). Letting it rip a bit more now!

So many parameter (to vary) - So little time (to test out)? 

Also finding "Narrow Band" can quite reduce available light!