Merely 6 hours of Lum data looks definitely better than I expected. This is a simple stack with flat calibration and histogram stretch only. I see I need to redo the flats and also perhaps also do bias calibration. Weather permitting, I hope to soon add an hour of colour per channel.
Thank you all for your encouragement. I'm collecting data for the last (blue) channel as we speak. Not sure if one hour per channel will be sufficient - will find out tomorrow. Yes, I would love to get Lum data from a dark site, but this unfortunately is not possible at this stage.
Just added about 1.5 hr of RGB data per channel. So all up I had just under 11 hours of exposure. Would love more data but I think it is time to start planning another target, this time in narrowband.
In conclusion, LRGB imaging is possible from Paddy in Brisvegas, but decent results require loads of exposure and skilful processing, and I lack in both.
Definitely an interesting experiment, Suavi, and a surprisingly good result under the circumstances.
Cheers,
Rick.
Thank you Kevin and Rick for you kind feedback and a very subtle advice I promise I won't try again LRGB imaging from our backyard
On a slightly different topic, I was quite unsuccessful with my first attempts at colour calibration with the new photometric calibration tool in PI, perhaps there isn't enough RGB data in this image?
On a slightly different topic, I was quite unsuccessful with my first attempts at colour calibration with the new photometric calibration tool in PI, perhaps there isn't enough RGB data in this image?
Suavi, did the graphs at the end show the data points nicely clustered along the line of best fit? I've not had a bad result from PCC so far, but I usually have good colour masters based on several hours integration time for each filter.
Suavi, did the graphs at the end show the data points nicely clustered along the line of best fit? I've not had a bad result from PCC so far, but I usually have good colour masters based on several hours integration time for each filter.
Cheers,
Rick.
One (top) graph was showing a nice trend (stars along the line of best fit), while the second (bottom) graph did not show a clear trend really. I feel RGB data was insufficient.
Glad you like it Colin. Gradients and dust bunnies were quite extreme and took a bit of experimenting to get them under control...
Hi Suavi, just had a look at the LRGB version and its not too bad. Only criticism I have is the pink centres of the galaxies, they should be more yellow. As you say maybe not enough RGB data to get a good colour balance.
I had a lot of trouble with gradients as well when I did them.
I played a bit with photometric calibration and I feel the galaxies are a bit better balanced colour wise, but now in turn some stars are a tad green...
....but I'd still get it under dark skies if I were you, will obviously be a big difference 
I promise I won't try again LRGB imaging from our backyard 
