Is there a standard for NTSC camera?

Discussion in 'Professional Video Production' started by peter, May 23, 2008.

  1. peter

    peter Guest

    I'm looking at the customize settings on a canon xh a1 and am confused.

    In the digital camera world, all cameras are calibrated to sRGB by default.
    Although some cameras produce more saturated colors and some allows you to
    adjust the saturation. Otherwise they are just sRGB. No cameras have
    parameters for gamma, knee, black stretch, color gain, skin color, etc.

    I don't understand why the xh a1 have all these parameters for tweaking. Why
    not just set the camera to the NTSC standard?

    Or is the NTSC standard so broad, that nomatter how I tweak those
    parameters, the camera still falls within the acceptable range of the NTSC
    standard?
     
    peter, May 23, 2008
    #1
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  2. peter

    ushere Guest

    simply put - ntsc defines a signal, not what the signal contains. washed
    out or oversaturated doesn't matter as long as the signal conforms...

    http://en.wikipedia.org/wiki/NTSC
     
    ushere, May 23, 2008
    #2
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  3. "peter" wrote ...
    sRGB is not a "calibration". It is a method of describing a color space.
    http://en.wikipedia.org/wiki/SRGB
    You have a very distorted view of colorimetry, camera parameters
    and features, the sRGB and NTSC standards, and what kinds of
    adjustments people commonly make to both still and video images.
    NTSC is not a "calibration standard" either. It is also a definition
    for encoding color. It doesn't care what the image looks like.

    That camera actually has fewer adjustments than professional
    models. The reason for all the adjustments is to produce the kind
    of images you want, particularly in less than ideal conditions.
    NTSC is not the "standard" as you seem to think it is, either.

    Making good looking images (whether still or video) is very much NOT
    a matter of just setting a camera to some default configuration and
    hoping for the best. The better an image looks, the more likely it was
    tweaked while shooting and/or in post-production to look that good.
     
    Richard Crowley, May 24, 2008
    #3
  4. peter

    peter Guest

    sRGB is not a "calibration". It is a method of describing a color space. Ok I guess I'm confused. So when people use colorimeter to calibrate their
    monitors, what standard are they calibrating to?
    Similarly, what is a calibrated monitor that video professional use? What is
    it calibrated to?
     
    peter, May 24, 2008
    #4
  5. peter

    Mike Kujbida Guest

    These are generally used for the graphics/rinting industry and would be
    calibrated to whatever the industry/manufacturer has determined to be a
    "standard".
    Pretty much any monitor that has features such as blue gun only, color
    off and underscan.
    Color bars.
    Color Bars and How To Use 'em at
    http://www.videouniversity.com/tvbars2.htm is an excellent tutorial on
    how this is properly done.

    Mike
     
    Mike Kujbida, May 24, 2008
    #5
  6. "peter" wrote ...
    Dunno. Ask them. Maybe they are calibrating white to some
    specific color temperature (like 6500 deg Kelvin?). Or maybe
    they are refering to setting the gamma curve. Or maybe they
    are talking about the bias and grid drive calibrations on their
    CRT monitor RGB electron guns. Herd to say absent any kind
    of context.

    Why do you ask? Perhaps if we understood where you are
    coming from, it would be easier to respond to your questions.

    If you qustion relates to still photography, there are news-
    groups that likely discuss the finer points of colorimetry.
    Likewise, if you question relates to video, there are other
    newsgroups that are chartered for discussion of the
    theoretical and technological methods used to produce
    color video images. And there are also newsgroups where
    discussion of theoretical color is chartered. But since we
    have no idea where you are coming from, it is difficult to
    recommend a good place for your questions.
    It is calibrated to a standard white color temperature.
    It is calibrated to a standard gamma curve.
    Calibrated picture monitors are effectively reference
    test equipment, not just something to watch TV on.

    There are prosumer-level devices available to perform
    a measured calibration on your computer monitor (etc.)
    For example...
    http://spyder.datacolor.com/products.php
    http://usa.gretagmacbethstore.com/
     
    Richard Crowley, May 25, 2008
    #6
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