Results 1 to 4 of 4

Thread: Blue fringe???

  1. #1
    Donal's Avatar
    Donal Guest

    Default Blue fringe???



    I'm a newbie who has been trying to get a decent picture of Jupiter
    since March.

    A recent thread made me wonder if I should buy the Baader Fringe killer
    filter. However, only last month, I was sure that I needed an IR filter
    to help me get better focused images of Jupiter. The IR filter has made
    no noticable difference to my images, although it does keep dust away
    from the CCD (or CMOS??) chip.

    I'd be grateful for some advice on the following images of Jupiter.

    <http://www.lanode.com/astro/1326.jpg> (10k)

    The image on the right is the result of stacking an RGB shift in
    Registax. Red was shifted down 3 and right 2, blue up 6 and left 3.

    The image on the left is the same image that has had the wavelets done
    in Iris.



    Both images seem to have a blue "fringe". This leads me to think that
    the lack of detail that I capture may be due to chromatic aberration.


    My scope is a Tal200K, which is an 8" reflector that has a correcting
    lens instead of a secondary mirror. The webcam is a Toucam Pro 840.


    Any comments would be gratefully appreciated.

    TIA


    Donal
    --


  2. #2
    Norbert's Avatar
    Norbert Guest

    Default Blue fringe???

    Donal nous a écrit :


    Hard task, Jupiter is not an easy planet to shot

    It is surely a good explanation, but the chromatism doesn't necessarily
    comes from your instrument.
    Atmospheric chromatism exists too, and the lower is the object, the
    higher it is.
    The color layers shifting with Registax is not enough in that case,
    because the blue layer and the red one does not have exactly the same
    size.
    Anyway, your picture is too red. I've re-processed your picture with
    wavelets in Registax, and an adjustement of the color balance :
    http://images.ciel.free.fr/test/1326xx2.jpg
    When you take the movie, take care of the white balance.

    --
    Norbert. (no X for the answer)
    ======================================
    knowing the universe - stellar and galaxies evolution
    http://nrumiano.free.fr
    images of the sky http://images.ciel.free.fr
    ======================================



  3. #3
    Donal's Avatar
    Donal Guest

    Default Blue fringe???


    "Norbert" <Xnorbert.rumiano@numericable.frX> wrote in message
    news:42c2ef71$0$168$a3f2974a@nnrp1.numericable.fr. ..


    I noticed this. I tried reducing the blue layer in the Gimp (a Photoshop
    lookalike), but the results were dissappointing. It seems to me that there
    was less detail in the blue channel.




    Thank's for the demonstration Norbert. That shows me that I can do better
    with the processing.




    Cheers



    Donal
    --




  4. #4
    Norbert's Avatar
    Norbert Guest

    Default Blue fringe???

    Donal nous a écrit :

    Not less details, but more noise.
    The blue channel is always the noisest one with a webcam.

    --
    Norbert. (no X for the answer)
    ======================================
    knowing the universe - stellar and galaxies evolution
    http://nrumiano.free.fr
    images of the sky http://images.ciel.free.fr
    ======================================



 

 

Similar Threads

  1. fringe woulds as for the technological conversion
    By Bert.Tallmadge@carpet.as.us in forum Amateur Astronomy Forum
    Replies: 0
    Last Post: 08-22-2007, 07:38 AM
  2. Fringe filters for non-APO refractors
    By Jay Ts in forum Amateur Astronomy Forum
    Replies: 14
    Last Post: 05-28-2004, 04:16 PM
  3. fringe analysis software
    By Eric in forum CCD Imaging Forum
    Replies: 0
    Last Post: 07-01-2003, 07:23 PM

Tags for this Thread

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts
  •  
Powered by vBulletin® Version 4.2.0
Powered by vBulletin®
All times are GMT. The time now is 05:09 PM.