Quote:
Originally Posted by Robert_T
Hi Bird, that's a spectacular shot, lovely smooth detail and an image scale that makes me weep! This is the colour I'm looking for too but which can never quite pull...light caremally browns. Any tips to get this?
cheers,
Rob
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Not really sure Rob - here's what I do, maybe some of this will be useful info...
- leave gamma set to "neutral", ie don't artificially darken the image while capturing as that loses information.
- capture lots of frames (I guess this is only useful for people with mono cameras and reasonable amounts of aperture on Jupiter). For this image I used:
60 seconds of R @ 40fps
60 seconds of G @ 45fps
60 seconds of B @ 35fps
With the Astronomik RGB filter set.
And I stacked the best 1500 frames from each set (as given by the -qestimator -qrenumber option in ninox). If you're feeling brave you can rely on Registax to find the best images instead but that never works properly for me :-)
In registax, use multipoint alignment and about 4 or 5 alignment points
- be gentle on wavelets after stacking, enhance only the fine details. Don't worry too much of some noise comes up as this will be removed later during deconvolution and smoothing.
- Load the result into Astra Image, deconvolve (this part is trial and error, the best settings wil depend completely on the mix of low and high frequency info in your image as well as how much noise is present).
- When you've done this for each of R,G,B, use the Astra Image recombine function to get a colour image
- save as a colour TIFF, load into the Gimp (you may use photoshop) and apply some selective blurring to reduce noise and selective unsharp masking to enhance detail, set levels, colour balance etc. Basically this last stage is where all the destructive things get done.
Some judgement is needed to decide where the line falls between small details and noise, basically you want to smooth everything below this line (noise) and enhance everything above the line (details). It takes some trial and error to find the right set of tools for the job.
As for the colour, I generally find the only change needed is to add some blue. I think the Astronomik filters have good colour balance built-in.
cheers, Bird
