PixInsight Forum (historical)

PixInsight => Gallery => Topic started by: Ryderscope on 2014 April 26 18:40:26

Title: Leo Triplet for review
Post by: Ryderscope on 2014 April 26 18:40:26

Posting this image of the Leo Triplet for review. I am very much a newbie to PI so would appreciate any feedback on processing and technique.

Details are:
Hardware: Skywatcher Blackdiamond 100mm F9 APO, Canon 60Da, EQ8 mount
Software: Capture in Backyard EOS, Processing in PI 1.8
Acquisition: 20 subs 450 seconds @ ISO800; 30 darks, 30 bias

http://astrob.in/full/92889/0/ (http://astrob.in/full/92889/0/)

Thanks,
Rodney

Title: Re: Leo Triplet for review
Post by: JoLo on 2014 May 16 09:29:12

Hey Rodney:

You sure you are a newbie?  Your image looks great.  I am a newbie too, so take below with grain of salt...

Does seem to be a bit too much blue in the mix.  Did you do DBE/BackgroundNeut/ColorCal on the RGB?  I like doing DBE on the individual greyscales just before combine, then do BN and CC after.  I do a saturation curve on linear, then revisit with the colorsaturation tool on non-linear.

Your noise levels look good, maybe a bit too smooth on the edges of the galaxies.  I like to use MMT (or ATWT or both) on linear RGB and L, then use ACDNR after LRGBCombine.  I try to get by with a minimum of smoothing on the first pass, it can be too much by the time you get to non-linear NR. 

I really like the MMT tool, and use it for both NR and sharpening.  I purchased the IP4AP DVD's on PixInsight, Warren does a great job with them and they have been a great help to me.  Put together a workflow based on the notes I took while reviewing the tutorials which I follow as a good basis, tweaking here and there based on the image.  He has a great process for using MMT for small scale (1-2) NR and ATWT for large scale (3-4) NR, that really works well.

Great image Rodney, you are well on your way.

Joe