I started imaging with Canon 600D/T3i a couple of months ago from a dark site about 20 minutes drive away, with some good results. Recently I purchased a CLS CCD filter and tried a few shots at NGC 281 Pacman from my bortle 6 home location but after processing in DSS resulting stacked tif image is saturated in green colour which I found very hard to remove.
Is there a good tutorial/book about post processing images taken in heavy LP. Thank you in advance
The CLS is notorious for doing this. The underlying reason is that it removes a large chunk of the spectrum, which _really_ makes getting good color difficult. I gave up on it, one gathers dust on my shelf.
People like instruction manuals. Unfortunately, DSO astrophotography does not lend itself to that. Too complex, one has to adapt to many situations, different equipment.
Tips on processing/imaging in light polluted skies. Mine are Red Zone, Bortle 7, mag per arc sec squared. My astrobin shows what I've done there, all but 2 DSO images came from my backyard.
General thing. More data is better. Longer total imaging times. More photons. Faster optics help a lot, consider getting a reducer if you don't have one, consider faster optics in your next scope.
Specific. Learn how to use gradient reduction well. Light pollution is a gradient, more at the horizon, less overhead. Astro Pixel Processor has an excellent gradient reduction tool that's relatively easy to use. There are others.
If your DSLR is modified. Imaging emission nebulae with a duoband filter works well. If the DSLR is not modified, the filter is useless. Consider getting an astro specific camera.
I try to never image below 45 degrees altitude.
Imaging from light polluted skies is neither easy nor cheap (both time and money). I get a great deal of satisfaction impressing my friends with what I can do from there. I spend a lot of time and some money (not a fortune, not just a little) to do that. The time is spent on research, learning, experimenting, and imaging.
The pretty pictures do not come easy. <smile>
Edited by bobzeq25, 24 January 2023 - 10:17 AM.