Purple Fringing on Mars!

Discussion in 'Digital Photography' started by iamsb, Jan 13, 2004.

  1. iamsb

    iamsb Guest

    Just noticed in the latest 12M panoramic from the Mars Rover that if
    you zoom in on the specular (sp?) reflection of the sun on the edge of
    the antenna disk you can see purple fringing around the white pixels.
    Best,
    Steve.
     
    iamsb, Jan 13, 2004
    #1
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  2. > Just noticed in the latest 12M panoramic from the Mars Rover that if
    > you zoom in on the specular (sp?) reflection of the sun on the edge of
    > the antenna disk you can see purple fringing around the white pixels.


    Apparently they are using Sony's new F828 on the Mars Exploration Rover
    Spirit.

    --
    Jaakko Holster
    /* Student of Information Engineering, University of Oulu
    Paalikatu 14 B 201, FIN-90520 Oulu
    holster at iki fi +358 41 436 0880 */
     
    Jaakko Holster, Jan 13, 2004
    #2
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  3. As my dad would say: "They can put a man on the moon but they can't....yada
    yada yada"

    It's good to know even those with $1,000,000,000 budgets have the same
    issues I do.


    "iamsb" <> wrote in message
    news:...
    > Just noticed in the latest 12M panoramic from the Mars Rover that if
    > you zoom in on the specular (sp?) reflection of the sun on the edge of
    > the antenna disk you can see purple fringing around the white pixels.
    > Best,
    > Steve.
     
    Shawn Westerhoff, Jan 14, 2004
    #3
  4. (iamsb) writes:

    > Just noticed in the latest 12M panoramic from the Mars Rover that if
    > you zoom in on the specular (sp?) reflection of the sun on the edge of
    > the antenna disk you can see purple fringing around the white pixels.
    > Best,
    > Steve.


    Hmm. If true, it would disprove a number of the theories about such
    problems in Bayer-array cameras and the Foveon chip. Obviously it's
    not a blooming effect causing green light to stimulate red and blue
    sensels, as the Mars cameras use monochrome CCD's and take three
    images with different filters to get color.

    --
    -Stephen H. Westin
    Any information or opinions in this message are mine: they do not
    represent the position of Cornell University or any of its sponsors.
     
    Stephen H. Westin, Jan 14, 2004
    #4
  5. iamsb

    jriegle Guest

    They must be using the lens from the new F828 :-D
    John (ducking, running)

    "iamsb" <> wrote in message
    news:...
    > Just noticed in the latest 12M panoramic from the Mars Rover that if
    > you zoom in on the specular (sp?) reflection of the sun on the edge of
    > the antenna disk you can see purple fringing around the white pixels.
    > Best,
    > Steve.
     
    jriegle, Jan 15, 2004
    #5
  6. iamsb

    Don Stauffer Guest

    Aren't some of these shots 3D anaglyphic images? I think they use red
    and blue filters. When these are combined they naturally have color
    fringes when viewed without colored glasses. Is this possibly what looks
    like the purple fringing? Incidently, CNN is reporting they intend to
    show a bunch of these 3D shots 'next' Friday. Not sure which friday
    they mean, but probably next week. They listed a number of places to
    get the glasses. I have a pair somewhere in house from a mag showing
    the ones Sojourner took. Hope I can find them.

    --
    Don Stauffer in Minnesota

    webpage- http://www.usfamily.net/web/stauffer
     
    Don Stauffer, Jan 15, 2004
    #6
  7. iamsb

    Isaac Kuo Guest

    (iamsb) wrote in message news:<>...
    > Just noticed in the latest 12M panoramic from the Mars Rover that if
    > you zoom in on the specular (sp?) reflection of the sun on the edge of
    > the antenna disk you can see purple fringing around the white pixels.


    It just occured to me--these shots are taken one color at a time
    using 3 color filters, right? Well, what happens if something
    is moving? You'll get some sort of color fringe artifacts.
    Perhaps the specular reflections of the Sun in question were
    moving fast enough to have such an effect.

    After all, the Sun essentially moves along with the sky's
    rotation--quite significant over several seconds. I noticed
    this while photographing the Moon with a tripod. The Martian
    day is actually a bit shorter than Earth's so the Sun's
    apparent movement would be even faster.

    Still, I would think the color filter order would place green
    in the middle to minimize this effect (either RGB order or BGR
    order). That would result in red/orange fringes and
    blue/cyan fringes, not purple. I suspect the correct explanation
    is higher order chromatic abberations, just as with normal
    color cameras.

    Isaac Kuo
     
    Isaac Kuo, Jan 15, 2004
    #7
  8. iamsb

    Guest

    Yes these are anaglyphs. The process makes them look fuzzy until you
    get the glasses. I got mine at:
    http://www.berezin.com/3d/3dglasses.htm
    They had some nice plastic ones.

    Reggie


    Don Stauffer wrote:

    >
    > Aren't some of these shots 3D anaglyphic images? I think they use red
    > and blue filters. When these are combined they naturally have color
    > fringes when viewed without colored glasses. Is this possibly what looks
    > like the purple fringing? Incidently, CNN is reporting they intend to
    > show a bunch of these 3D shots 'next' Friday. Not sure which friday
    > they mean, but probably next week. They listed a number of places to
    > get the glasses. I have a pair somewhere in house from a mag showing
    > the ones Sojourner took. Hope I can find them.
    >
     
    , Jan 18, 2004
    #8
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