30 July 2020 - APP 1.083-beta1 has been released introducing Comet processing! This 1st beta has comet registration. The stable release will also include special comet integration modes.
9 July 2020 - New and updated video tutorial using APP 1.081: Complete LRGB Tutorial of NGC292, The Small Magellanic Cloud by Christian Sasse (iTelescope.net) and Mabula Haverkamp
2019 September: Astro Pixel Processor and iTelescope.net celebrate a new Partnership!
"Purple haze" left behind after dark subtraction?
Good song, but not something I like to see in my pictures!
To be fair, I didn't really notice it until I made a mosaic. I guess it shows up better when the whole image is resized to fit in the window. But yeah, it seems there is a purple haze left over after dark subtraction. I use a QHY183C, so temp and offset are the same as the lights.
My stack settings are:
Ha-Oiii color (Optolong L-eXtreme filter)
Default settings. Adaptive pedestal/reduce amp-glow is checked
Default settings except; 1st degree LNC/3, Enable MBB 5%, Bayer Drizzle
Am I screwing something up here, or is there anyway to tweak this?
I have processed part of the image to show the haze better. Like I said, it is hard to make out in the single image. But once combined into a mosaic, it is easy to spot.
Are you sure this is actually a processing artifact? I think you are very probably looking at some very faint Ha emissions.
Take a look at this image and you can see a similar deep red/magenta haze.
Maybe try minor adjustment of Green/Magenta balance. Very decent image though. I like the filimentary blue O3 detail.
Hmmm maybe you are right... I did not see it in other pictures though. If it is real, it should show up in the next panel whenever I get some clear skies again!
Right, I finally finished the Cygnus Loop mosaic, and there is now no doubt there is a purple glow left behind. The new frames covered over the problem area last time, and as you can see - no glow there now. But as we can also see, the new frames have the same glow on the left.
Im only shooting 5 min subs at unity gain, so I don't think the "amp glow" is clipping. Is this a OSC problem?