Quote:
Originally Posted by alpal
Hi Peter,
David Malin's images seem to be all red too.
What about this image?
http://www.wolaver.org/Space/carinanebula.jpg
http://www.wolaver.org/Space/carinanebula.htm
Oxygen is giving the blue colour which means my DSLR camera is not lying.
It's true however that a DSLR doesn't have good quantum efficency at Ha .
It's also true that blue should be there in your data.
Don't get me wrong.
You have taken a fabulous picture - that I could only dream of taking. |
You're suggesting David Malin's images are too red??
... sorry the AAT team went to some lengths to ensure the calibration of their (emission line) data.
Your links are to SII, Ha, OIII...ie false colour images, it make no sense to compare that to a RGB image.
Yes, there is indeed H-beta (magenta) and OIII (cyan) at the core of the nebula, and this should give it salmon/magenta colour.... but "DSLR" blue it simply isn't...
That's plain and simple a limitation of DSLR and non-daylight light sources.
Helmholtz colour theory covers this pretty well.