Eta Colour - Work in Progress

wysiwyg (Mark) · #1 17-05-2010, 09:21 PM

Hi,

Finally I have had the opportunity to gather some colour data this weekend for my Eta image.

Eta HaLRGB

Hard work is paying off :-)

Thanks for Looking!

Mark

Peter Ward · #2 17-05-2010, 09:50 PM

A very pretty vista Mark.

Cyan halos around stars with a Ha blend however are a trap...the image just needs a few tweaks before it can go to the top shelf. Otherwise well done!

Stick with it.

dugnsuz (Doug) · #3 17-05-2010, 09:55 PM

Nice stuff Mark
I'd love to see the LRGB portion of this image.
The detail, depth and texture in the HaRGB are excellent.
The stars in the 'large' pbase image have that blended look to them though - I'm sure you'll sort that out (first draft!?)
This is the kind of stuff I thought you would produce when I saw that you'd got all that high end gear.
Very,very nice.
Doug

wysiwyg (Mark) · #4 17-05-2010, 10:01 PM

Thanks Peter, Doug!

Yes those Halos are a pain!
I'm very new to blending so I am still working through the different techniques but those halos are becoming very stubborn.

Happy to hear any ideas or techniques that have worked for you guys....

Cheers
Mark

Vanda (Ian) · #5 17-05-2010, 10:22 PM

Top stuff!

dugnsuz (Doug) · #6 17-05-2010, 10:55 PM

Quote:

Originally Posted by wysiwyg

Happy to hear any ideas or techniques that have worked for you guys....

Cheers
Mark

Wish I could give sage advice, but every image seems to throw up different problems and possibilities!
When blending in Ha data in PS I find that a Luminosity layer of around 20-30% is as much as is needed before halos develop.
But, my 40D is a world away from the processing possibilities afforded by the data from your SBIG.
Paging Dr Ward!!

TrevorW · #7 18-05-2010, 12:13 AM

Nice detail but some how too's would be helpful though

wysiwyg (Mark) · #8 18-05-2010, 03:30 PM

I found an interesting tutorial by Robert Gendler on incorpoarting Ha Data to an RGB image.
http://www.robgendlerastropics.com/HARGB.html
This may well do the trick on my blue halos.

Mark

leon · #9 18-05-2010, 04:54 PM

Top stuff mate, it looks awesome, well done.

Leon

iceman (Mike) · #10 18-05-2010, 05:00 PM

Beautiful detail and colour, and a lovely composition.
Nice work!

telecasterguru (Frank) · #11 18-05-2010, 05:16 PM

Very fine capture and well on the way to being great.

Frank

wysiwyg (Mark) · #12 22-05-2010, 12:51 AM

Thanks very much guys, I really appreciate the feedback.

Mark

Hagar (Doug) · #13 22-05-2010, 09:54 AM

Very nice Mark. Star colour is my bug bear when blending Ha into an RGB image but there must be some way around it, just not sure how.

RB (Andrew) · #14 22-05-2010, 12:07 PM

Lovely work Mark.
The original size image is beautiful to view.

jase (Jason) · #15 23-05-2010, 08:29 AM

Miraculous details Mark. Ha blends do get tricky, especial when managing the stars. I typically create a basic RGB master and re-layer the stars, but this only works for specific conditions. What you're seeing is the Ha data has significantly tighter stars (due to reduced energy pass thru of the narrowband filter) than your RGB broadband data. The RGB data will result in a ring around the smaller Ha data star centroid. This is where it helps to create a Ha+L layer for your luminance as opposed to a Ha only. So that the luminance brings back the stars to regular sizes and are easily matched to the RGB data. Alternative create a synth lum from the RGB data. What ever the choice, there is one thing to remember with Ha blends. Anything that is pure white (reaching close to saturation) in your luminance cannot be colour with your RGB data. This could be bright knots of nebulosity or stars. The latter is important given the desire to maintain natural colours. Shades of grey on the other hand can be coloured. So whilst its awfully tempting to push the Ha data hard, it will be difficult to match it to colour data if you're not careful.

Look forward to seeing more.

Cheers

wysiwyg (Mark) · #16 23-05-2010, 11:14 AM

Quote:

Originally Posted by jase

Miraculous details Mark. Ha blends do get tricky, especial when managing the stars. I typically create a basic RGB master and re-layer the stars, but this only works for specific conditions. What you're seeing is the Ha data has significantly tighter stars (due to reduced energy pass thru of the narrowband filter) than your RGB broadband data. The RGB data will result in a ring around the smaller Ha data star centroid. This is where it helps to create a Ha+L layer for your luminance as opposed to a Ha only. So that the luminance brings back the stars to regular sizes and are easily matched to the RGB data. Alternative create a synth lum from the RGB data. What ever the choice, there is one thing to remember with Ha blends. Anything that is pure white (reaching close to saturation) in your luminance cannot be colour with your RGB data. This could be bright knots of nebulosity or stars. The latter is important given the desire to maintain natural colours. Shades of grey on the other hand can be coloured. So whilst its awfully tempting to push the Ha data hard, it will be difficult to match it to colour data if you're not careful.

Look forward to seeing more.

Cheers

Thanks Jase,

I have not had a chance to further play with my subs yet. Your explanation certainly makes sense and I will definitely be trying it out. Its a learning curve for me at this stage so any piece of advice is appreciated.
Hopefully I can get a repro done soon!

Thanks again!

Mark