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TG /TB for OSC CCD

NJSG
2021-09-08
2021-12-29
  • NJSG

    NJSG - 2021-09-08

    Han,
    I've been using your program to process Variable star data and uploading it to AAVSO for a few weeks now. ASTAP is fantastic and I haven't even used all the other features.
    In a discussion with one of the AAVSO members, the suggestion was made to transform the TG/TB data to V and B filter values and report them as such. I know you program isolates the Green channel from the raw Fits image. I was wondering if you had a module that would also extract the Blue channel? AAVSO has a tool that accepts B and G images and calculates the transformation coefficient for those filters.

      Thanks
      Nor
    
     
  • han.k

    han.k - 2021-09-09

    Hello Nor,

    Adding blue will be easy. I'm a little worried that for blue or red this will be only 1/4 of the image pixels, so you have to use a little defocused images before it will work properly. So I have delayed implementing till more practical experience was obtained.

    I will add both blue and red channel the next days. Easiest will be to produce all three colour files in one step. Any feedback or comparison with other implementations&software will be good to have.

    As a side note:
    Theoretical it would be possible to process all three colours in one step from the raw, but that will be tricky and requires a complete different star detection routine and background detection. Orginal RAW files look visually also not good due to the imbalance of the R,G,B pixels. So this option is not something I will implement.

    Han

     
  • han.k

    han.k - 2021-09-09

    Looking into the code, this is already implemented in the batch menu. I will make it more visible in the photometry tab:

     
  • han.k

    han.k - 2021-09-09

    Okay implemented in development version 0.9.576. Added a new menu. See attached.

    I also fixed also an error in red/blue extraction. The best demosaic pattern is probably "auto" if your using the Libraw option for raw conversion. That should work. Double check the RAW demosaic pattern also with a terrestrial image with some colour in it.

    Download the (Windows) development version from here
    http://www.hnsky.org/astap_setup.exe

    Regards, Han

     

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