Poor quality images on projector despite high quality scan

Discussion in '35mm Cameras' started by Nikolaj Winther, Feb 17, 2005.

  1. Hi,
    I'm due to give a lecture on my experiences in Australia, and I need
    to show some pictures I've taken in that regard. I've also downloaded
    pictures of exotic, yet common animals in Australia, that I don't have
    any pictures of myself.

    Now, I figured that by scanning the negatives in a fairly high
    resolution, I'd get the best results. I have a Canon semi-pro scanner
    that works fine (usually). Now I scan these negatives, and on my
    computer-monitor they look exellent - much better that the ones I've
    downloaded. I figured I'd burn them on a CD and show them using a
    DVD-player and a Big-screen projector. This seemingly works fine,
    except that the images that I scanned myself look horrible - whereas
    the infirior downloaded images look fine!

    Is there any reasonable explanation on why this is - and what I can do
    to fix it.

    And on a related matter - I thought about using the computer as a
    player, and just connecting it to the projector, that has a cable like
    the computer-monitor - but I get a NO SIGNAL. There's a switch on the
    projector that says "tv"/"Computer" and I have it on "Computer". Do I
    need a driver og is there some special something I have to activate on
    my computer?

    Any help would be welcome.

    Regards,
    Nikolaj Winther
     
    Nikolaj Winther, Feb 17, 2005
    #1
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  2. Nikolaj Winther

    Paul Bielec Guest

    You should verify what are the maximum resolution, the number of colors
    and the frequency supported by the projector.
    Just to make sure that the signal goes through, change your display
    settings to 640x480, 256 colors and the lowest frequency for the graphic
    card. Once you get that working, you can increase the quality.
     
    Paul Bielec, Feb 17, 2005
    #2
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  3. Nikolaj Winther

    Matt Clara Guest

    Your high quality scans most likely contain a pixel count well above what
    your projector can deliver, thus your images are being quickly and roughly
    downsampled to fit your projector's needs. Figure out what your projector's
    specs are, and rework your images to fit the requirements. Save your
    original big scans, though. Those are great for printing!
     
    Matt Clara, Feb 17, 2005
    #3
  4. Nikolaj Winther

    Alan Browne Guest

    You don't say "what" is bad about them, but I'll take the following whack at it:

    Projectors do not have very high resolution. In photoshop you must re-size your
    images to the projection resolution. At that size, use USM to achieve clean and
    haloless edges.

    If you embed the images in a Powerpoint or such, then again, the image must be
    sized correctly and USM'd for its size when projected.

    You may be having color problems as well, so edit the images using the projector
    nearby (this is the quick and dirty way).

    Cheers,
    Alan
     
    Alan Browne, Feb 17, 2005
    #4
  5. Direct your queries to comp.sys.laptops - people there have a lot of
    experience in projecting presentations. I can tell you that this problem
    with terrible looking photos seems to happen absolutely loads - everyone
    seems to fall foul of it. However, it's not necessarily to do with your
    large file size - usually it's a problem more fundamental due to screen
    resolutions and projection resolutions not matching. MS Powerpoint will do
    an o.k. job of re-sampling the image to fit the screen, but this isn't all
    that's required.

    As I said, redirect your question - it happens so often, someone will have a
    clear answer there.

    Duncan.
     
    Duncan J Murray, Feb 19, 2005
    #5
  6. Nikolaj Winther

    chrlz Guest

    ...and on the second point, if your computer is a laptop, look for a
    little picture of a monitor - often it's on the F4 key. Holding down
    the laptops `Fn` key, and tapping F4 (or whichever) will then redirect
    the display signal to the data projector. Check the laptop's manual.

    If that doesn't help, check your display card's resolution and make
    sure it is in range (both resolution and color depth) for the
    projector.

    If all this sounds like gibberish, you really need to go find someone
    who has done this stuff before, and take copious notes..!
     
    chrlz, Feb 19, 2005
    #6
  7. Nikolaj Winther

    Roxy d'Urban Guest

    As the others have mentioned, this is a common problem with digital
    projection. Anything above the resolution of the projector is going to
    look crap because the VGA card of your laptop is sending a massive image
    to a device that can probably only project at either 640x480 or 800x600
    pixels at a time.

    Change your scanned images to 72dpi and size them to the same dimensions
    as your projector.
     
    Roxy d'Urban, Mar 4, 2005
    #7
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