Quote:
Originally Posted by Peter Ward
Artistic license aside....and sure your can make the sky look green with Photoshop or a badly calibrated camera....emission nebulae are red, red, red, just as the sky is blue.
Where is the problem with this patently obvious observation?
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The problem is that someone assigned an arbitrary primary colour to Ha. The red part of the spectrum contains every shade of red there is. Infra red is not red, it is below red and has no colour that the eye can really perceive. Some night vision goggles assign green to infra red and this is just as correct as assigning red.
Ha accounts for a tiny wavelength of the red colour of the spectrum, at the most it is a very very very dark shade of red.
The hubble palette is just a convention and i reckon assigning Ha to red is just a convention as well.
As far as artistic license is concerned. Well, shooting DSO's is like someone who just likes to shoot a small subset of say cat's. There are only so many and they get done over and over and over and over again and again the same one. Fine, i like doing this, and if my tarantulas come out blue, well i like that ghostly look.
The reason i am posting this is again you have made a value judgement. You havn't just said hey i think nebs are red and left it at that, you are trying to force your opinion down everyones throat. Well good luck to you. I got what you wanted to say in the first post, so cant you just leave it at that?
Paul