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Advice on enhancing digital image

  1. Mar 17, 2007 #1

    DaveC426913

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    I've got a sequence of pictures from my camera of some very distant buildings (~20mi) that I'd like to digitally enhance. I took about 20 shots in rapid succession in the hopes that I can combine them to produce a better image.

    My first attempt will simply be to overlay them in PhotoShop and use the 'multiply' or 'difference' blend.

    I'd like some advice on how to easily enhance these. (This is just for fun. I don't mind downloading some s/w package, but I'm not going to go to great lengths.)
     
    Last edited: Mar 17, 2007
  2. jcsd
  3. Mar 17, 2007 #2
    You could try stacking the images with Registax. Then use PhotoShop to edit your final image.
     
    Last edited: Mar 17, 2007
  4. Mar 18, 2007 #3

    DaveC426913

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    Thank You! Cool program! Here's my results:

    Whenever I come over the Islington bridge into New Toronto I get a gorgeous view of Lake Ontario. On a clear day, I can see the water tower in Niagara-on-the-Lake, but I've never seen this far before.

    Today I could see tall clustered buildings. Could it be? Could I be seeing 40 miles all the way to Niagara Falls?

    Probably, but I never miss an opportunity for geekiness.


    So I snapped off about twenty identical shots:
    [​IMG]

    You can just barely see the horizon lost in the haze.

    Then I ran them through RegiStax. (cool program!)

    And then I checked GoogleEarth and plotted the line of sight from Toronto, rotating the satellite image appropriately.

    Then I looked for likely candidates - the Skylon Tower being the most obvious (the leftmost - looks like the CN tower). Long shadows are easier to spot than actual buildings.

    And lookie!

    [​IMG]

    P.S. The reason Niagara Falls was visible today is not because the air was particularly clear, it is because of the Mirage Effect - specifically a superior Mirage. Niagara Falls, being 40 miles away is over the curve of the Earth, but the air over the water bends the light over the curve, creating an image above that of the position of the actual object, thus:
    [​IMG]
     
    Last edited: Mar 18, 2007
  5. Mar 18, 2007 #4

    russ_watters

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    This may be of interest. It'll tell you just how far your horizon is and how high objects have to be to be visible (normally): http://www.boatsafe.com/tools/horizon.htm

    Near as I can tell, the observation deck is about 450 feet up and the base is 250 feet above the lake, which puts its horizon at 35 miles. Judging from your picture, you are a good 40 feet up, which puts your horizon at 8.5 miles. So I think you should be able to see it on any decent day.
     
    Last edited: Mar 18, 2007
  6. Mar 18, 2007 #5

    robphy

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    What did one or two of your originals look like?
     
  7. Mar 18, 2007 #6

    DaveC426913

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    Huh. That makes sense but it's not true in reality - and I look all the time. (I always spot the water tower in good days.)



    I don't know how high above the water I am, though it shouldn't be hard to figure it out. I'm only 1/4 mile from the lake but I'll have to check on the height of the bridge.

    That was one of the images I attached in my post.
     
    Last edited: Mar 18, 2007
  8. Mar 18, 2007 #7

    robphy

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  9. Mar 20, 2007 #8
    My backyard. I coudlnt figure out how to use that program to put them together though..

    Redid a better picture.

    [​IMG]


    I had the camera on a roll of paper towels and turned it, so it was always level. You can see when I put the pictures together how the time stamp drifted. Turns out that every time you rotate the camera, you need to tilt it for the pictures to match.
     
    Last edited: Mar 20, 2007
  10. Mar 20, 2007 #9

    robphy

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    Although my post is a little off-topic, cyrusabdollahi's composite photo reminded me
    of this new Microsoft project: http://labs.live.com/photosynth/,
    which creates a virtual world from a collection of photos that it somehow
    stitches together in 3D. It's rather impressive. (The "Tech Preview" is an ActiveX plugin.)

    Here's an image from someone's flickr contribution:
    [​IMG]
     
  11. Mar 20, 2007 #10

    DaveC426913

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    Sure. If I were impressed by watching my computer puke.
     
  12. Mar 20, 2007 #11

    robphy

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    Worked for me.
     
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