Trying different processing steps to minimise the "hard edge" that seems to appear around the sunlit side of Mars.
Seems like it's a real phenomenon, maybe dust or refraction in the martian atmosphere, but many processing steps really enhance it too far.
I'm now experimenting with a modified processing sequence consisting of mostly filtering + smoothing and leaving out the Lucy-Richardson deconvolution that I found so effective on Jupiter.
Another trick I'm trying is to set the high numbered wavelets in registax to -1 or lower. This has the effect of subtracting detail that is large in scale and has a distinct edge - on Mars this is mostly the bright edge.
Here's the red-light image. The bright edge is much reduced.
This is a stack of 2000 frames taken at a focal length of 10,000mm through a PGR Dragonfly Express camera. Expsures for each frame were around 20ms.
The scope is a 10" f/6 newtonian.
regards, Anthony
Seems like it's a real phenomenon, maybe dust or refraction in the martian atmosphere, but many processing steps really enhance it too far.
I'm now experimenting with a modified processing sequence consisting of mostly filtering + smoothing and leaving out the Lucy-Richardson deconvolution that I found so effective on Jupiter.
Another trick I'm trying is to set the high numbered wavelets in registax to -1 or lower. This has the effect of subtracting detail that is large in scale and has a distinct edge - on Mars this is mostly the bright edge.
Here's the red-light image. The bright edge is much reduced.
This is a stack of 2000 frames taken at a focal length of 10,000mm through a PGR Dragonfly Express camera. Expsures for each frame were around 20ms.
The scope is a 10" f/6 newtonian.
regards, Anthony
Attached Image:
http://www.acquerra.com.au/astro
