Doug,
There are a couple of renditions of Eta on my website, a "blue" one
http://www.atscope.com.au/newsky/etasho_stl.jpg was taken with a narrow band Ha, OIII and SII set, the other
http://www.atscope.com.au/newsky/carina_stl.jpg with a standard RGB set...the latter being a red/magenta colour.
The centre of Eta, indeed a number of nebulae have quite a lot of H-Beta...with a strong blue component....which is what you may be seeing.
The core of the Tarantua has this as well, but the outer regions of both are well and truly H-alpha red.
Also I am not saying don't get out there, have a go and have some fun.
But when you post a blue NGC 2070, as I said earlier, it's like people with green skin....fun perhaps...but accurate? No.
The fix is so simple, and does not require a $10K CCD. Just ramp up the red channel in Photoshop.
Why strive for accuracy? Images with excellent colour fidelity tell a story about the real physical processes going on in an object. Plus getting it right, I believe helps other aspects of you image processing skills.
Quote:
Originally Posted by Hagar
I notice on your web site an image of Eta Carinae Nebula taken with an SBIG CCD camera. It appears to all wants and purposes to have the same colour cast and tone as my images of Eta Carinae. I realy have trouble understanding why an item like Eta C can be so similar yet Tarantula so diferent.
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