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Please Recommend Some Of Your Tutorials For Reworking This Project

Nimbus7
in PixInsight
Instead of asking a lot of questions I thought it best just to get your opinion for reviewing your relevant tutorials to rework this most recent project.  Not happy with it's current state as it's color balance seems to keep favoring magenta and my processing sessions are irregular so I have to keep reviewing things on here. I have all the Xterminator tools and did SPCC in the early stages.


For some reason my file upload doesn't want to complete so will use a link instead.

Thanks,
Bill

Comments

  • Nimbus7
    Not sure if I have enough signal but I would like to bring out those blue clumps a little better than shown if possible.

  • BlockHeadBlockHead
    The Triband filter, if I recall the bandpasses, cuts out a lot of the light that galaxies emit since they are continuum sources. Your filter will be better for nebula in general. I do not have a tutorial to work with data like this because, for galaxies in particular, it really makes it *harder* to get good results... not easier. You are working against the equipment and I feel it isn't being helpful. I think of this kind of filter as a slightly wider narrowband filter for OSC. Sure, it will cut down on the LP... but it also doesn't permit enough wavelengths to come through to get colors of galaxies easily. You are getting magenta since the light from the galaxy will be brightest in red certainly...and probably blue. There isn't an OIII contribution here that is strong. 

    -the Blockhead


  • Nimbus7
    Not sure we have the same Triband in mind.  This one is the Antlia Triband RGB Ultra.  They claim the following:

     The spectral design
    selected the most substantial information in the RGB bands, which makes
    Antlia Triband RGB Ultra Filter II possible to shoot over 90% of deep
    sky objects, in addition to its excellent performance on emission
    nebula, different from other ultra-narrowband filters, it is able to
    capture galaxies, reflection nebulae,     and star clusters from a Bortle 8
    location to Bortle 1 while presenting more balanced RGB colors in your
    images. Also, it has a broad bandpass designed to cope with faster
    optics up to the f/2 focal ratio.


    I also have the IDAS LPS D1  and D2 on hand as well.

    Was under the impression before I bought the Antlia Triband RGB the users on Cloudy Nights were happy with the galaxy performance.  I guess I could reshoot next year with a D2 if you still think this Antlia is a bad choice for galaxies.

    Thanks


  • BlockHeadBlockHead
    I understand the marketing. 
    For example.... read this post (you can look at the entire thread):

    Just look at the bandpass graphs for this filter. This filter will absolutely favor "magenta"... and you will need to take some extra steps to unweave the rainbow that are specific to this kind of data. 

    Do you see high quality images of galaxies with this filter published? 
    That might be helpful.

    -the Blockhead
  • Nimbus7
    I read a lot of those last year and don't remember my conclusion as there was a good mix.  Well I guess I did make a conclusion if I bought one.  Your interpretation of the bandpass graph is helpful. I used the choices for that filter in SPCC.  Since I am changing out my scopes on the mount and will start using a 10" F/4 will go back after the same object next year and use my 268M instead with a IDAS D1 or P2.

    Fred commented some on PI about the Antlia Triband RGB:

    Pixinsight forum

    Thanks again--Bill
  • Nimbus7
    edited March 31
    Went ahead and did a little more work on my earlier version and seems to be an improvement to my 76 year-old eyes.




  • Nimbus7
    Anyway, I was hoping that you would still make mention of some of the tutorials that could be utilized for this particular image set in regards to "bringing out the detail" instead of just the magenta issue.  Unless of course this image set could not be improved.

    Thanks~Bill

  • BlockHeadBlockHead
    When I look at this image- I think that some of your choices may have "baked in" the ultimate result you were moving towards. Could you give me a run down of what you did do? Then I think I would be in a better place to make a recommendation. If I point our a video (like M83 which is the obvious one for you to look at)- my choices are not necessary going to align in such a way to be helpful if you choose a very different path.

    I would also say you have black clipped the image. The super high contrast actually makes it harder to enjoy details- but you haven't left enough enough intermediate tonal values.

    Let me know your workflow...
    -the BLockhead
  • Nimbus7
    Thanks for your input Adam,  I think I might start anew next year on this object and add some more subs and try to get close to 8-10 hrs. total.  One thing I seem to remember early in the processing while still linear using GradientCorr, BXT, NXT at half strength and SPCC I didn't have much black shoulder left on the histogram before going non-linear.  Perhaps my camera offset is not enough.  Loaded the Master Dark into histogram transformation and as soon as I touched the low end caret the image went dark in the preview before even moving it towards the left shoulder. Was running 56 gain and 35 offset.

    Changed out my scope and also added my 268M mono cam and will see how the next sessions work out. Won't trouble you further on this subject.

    Thanks.
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