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Old 01-01-2015, 09:10 PM
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sjastro
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Tarantula Nebula separated into OIII and Ha emissions

Generally I try to avoid imaging common objects unless I am trying out new techniques.
One technique under development is to separate out OIII and Ha dominant features in an object and enhance each wavelength by remapping the colour.
In this case OIII is mapped to cyan and Ha to red.

The Tarantula is a good target, because it is bright in both OIII and Ha.
The challenge is identifying the dominant wavelength and is achieved by using a (OIII-Ha) and a (Ha-OIII) mask.

A conventionally processed image can then be remapped through each mask revealing and enhancing details that are not commonly seen.
The other advantage is that star colour balance is maintained.

2 hrs OIII + 2 hr Ha as a luminance image. 1 hr RGB each.
BRC-250 and STXL-11002 CCD.

High resolution image.
http://members.iinet.net.au/~sjastro/Tar_OIII_Ha.html

Clear skies

Steven
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