Quote:
Originally Posted by Placidus
The finest dust lanes, especially on the near edge, remain wonderfully sharp and clear and contrasty, and this is perhaps the greatest strength of the image.
We wonder if something went very slightly wrong during the colour processing. We can see from the striking and topographically correct colour in the main galaxy - blue OB clusters in the spiral arms and beautiful salmon pink in the nucleus, that the underlying colour data is very good.
Conversely, the brighter stars are on average white but show much colour variation within a single star. I don't think it's registration or chromatic aberration. Perhaps the star colours got clipped to white, and then an increase in saturation produced colour artefacts and a somewhat all-or-none effect in the galaxy.
(I'm nervous about saying this, because I had a good look at our NGC 253, and the colour is very dubious indeed. You're doing better than we did!)
Despite that minor niggle, the colour has added greatly to an already lovely image.
Best,
Mike
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Quote:
Originally Posted by Atmos
Not quite sure what has happened with the star colours there, they've gone a bit rainbow. The galaxy itself looks pretty good though  |
Thank you Mike and Colin.
I certainly lack experience with LRGB imaging. I attempted photometric colour calibration on this image but it didn't help with star colours. I think Mike is spot on with diagnosis - I overexposed many stars and that clipped colour data, so I tried to recover that by boosting saturation quite a lot. Next LRGB image will have shorter exposures (not 15-minute ones).
Thank you again for taking time to look at my image.
Suavi