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Realistic colors for monitors ?

Discussion in 'Electronic Design' started by Skybuck Flying, Apr 12, 2010.

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  1. Hello,

    The RGB color space does not contain/display all colors we humans see in

    In reality we humans see more colors in real-life than our monitors can

    I was wondering if nvidia is researching graphics cards and/or monitor which
    try to display "realistic colors" ?!?

    If not it would seem to me that "they" have the most to gain from such
    technology and should therefore research/develop it ?!?! ;) :)

    Might be the next big thing or maybe not...

    I do wonder what "changes" would be needed to the current system...

    How many bits would be necessary to display all colors ? Would it still be
    an RGB system or would it need something else ? ;)

    I can vagely remember one company investigating such technology and working
    together with some animation studio... like pixar ? or industrial light and
    magic ?

  2. Maybe it's not about "number of colors" but the "color range" itself.

    Like deep black, and very white.

    And very red and very blue, and very pink, very orange and so forth.

    Monitors seem to be limited to a certain color range.

  3. For that you would need monitors with an infinite number of primaries.
    As (most) monitors and the color system of the computer-monitor
    connection (say VGA and DVI) are based on three primaries, all colors
    that can be reproduced by a monitor are contained in a triangle in the
    xy color space whose edges are given by the (phyiscal) colors of the
    monitor (inside the full gammut). However, the gammut of visible colors
    in this space is certainly *not* triangular, thus necessarily colors are

    It is not a matter of the monitor or the graphics card, but the whole
    system to signal colors.
    Not a matter of bit-count (alone). The bit-count only defines the
    precision by which colors can be represented, not the size of the gammut.
    OpenEXR, by ILM. But this is on high-dynamic range images, i.e.
    representing several magnitudes of luminance. But it is still based on
    three primaries, and so are (most) capture devices and (most) display
    devices. IIRC, the primaries can be specified, thus it is possible to
    describe "virtual" colors outside of the visible gammut and thus
    describe all visible colors. However, since the monitor and the
    monitor-computer link is constrained to "physical" colors, that itself
    doesn't buy you much; it is a win for processing images - i.e. in the
    image or movie processing toolchain, because coding loss can be avoided.
    This is what it has been designed for.

  4. I have seen drawings trying to explain it... the "true" gammut seems a bit

    Maybe a (cubic?) spline system is needed... where the coordinates form some
    kind of spline to specify the resulting color...

    Would that help ? ;)

    Skybuck ;) :)
  5. Using readily available high efficiency CRT phosphors, the gamut is
    quite limited which is
    used on many computer monitors and HDTV displays. The current SDTV
    primaries do not differ much from these.

    The original (1953) NTSC primaries had the green point much closer to
    the top of the gamut, thus capable of producing deeper greens.
    Unfortunately, the available phosphors had a low efficiency, thus,
    producing dim pictures.

    A much more radical color space is at which would be OK
    for a transmission and production standard, but would cause a lot of
    problems displaying it.

    The could
    be quite good if monochromatic emitters at 700, 545 and 380 nm would
    be available. Wouldn't adding a fourth emitter at 515-520 nm cover the
    whole gamut ?

    While in the past it has been necessary to specify the update rate,
    spatial resolution, gamma and color space according to the available
    display technology (CRT), does it make any sense to design new image
    processing, storage and distribution standards according to some
    obsolete display standards, when most likely, the display technology
    will change every few years ?
  6. Copacetic

    Copacetic Guest

    Since they are illuminated pixels, what are the prospects for OLED being
    the leader in visual gamut coverage?
  7. However, usual monitors cannot output some of the colors that human
    vision can process, including some that are common to see in real life,
    such as:

    * LEDs of a more pure red shade, such as most having nominal peak
    wavelength of 660 nm. Their "dominant wavelength" (which is a color
    specification largely meaning "hue") is usually around 640 or in the 640's
    of nm.

    * Other more-pure reds, such as common red diode lasers (usually in or
    near the 645-650 nm range), He-Ne lasers (632.8 nm), and incandescent red
    traffic signals (dominant wavelength is often close to 635 nm). Or any
    incandescent or daylight light source (or any of most xenon light sources)
    filtered by a #29 or #92 Wratten filter or Schott or similar longpass
    glass filters with cutoff wavelength (50% point) 620-665 nm, or other
    similar deep red longpass filters.

    * Deeper non-yellowish and less-yellowish greens, and deeper bluish
    greens, such as 532.8 nm green lasers, and most InGaN green LEDs including
    most LED green traffic signals. And especially an InGaN green or
    blue-green LED with dominant wavelength anywhere from 490 to 535 nm, after
    being filtered by common deep green acrylic sheet such as green

    * Some deep blue light sources, such as most common turquisish blue InGaN
    LEDs with dominant wavelength 470-475 nm, 473 nm DPSS lasers, or almost
    any InGaN blue LED filtered by almost any deep blue filter.

    * Deep violetish-blue light sources, such as a "BLB" blacklight fluorescent
    lamp, a mercury vapor lamp filtered by a deep blue filter such as Wratten
    47B or a deep blue dichroic filter, many "royal blue" LEDs especially if
    filtered by a deep blue filter, a violet or UV LED whose visible content
    is passed through a deep blue filter, a Cree "standard blue" LED filtered
    by a deep blue filter, or a He-Cd laser.

    * Deep violets and purples, such as combined output of a "royal blue" LED
    and output of a red one whose peak wavelength is 660 nm.

    * Most CRT monitors do not show truly deep greens, yellows, oranges or
    reds of any hue, since the red and green phosphors in those are only
    something like around 95% saturated (much less still for green according
    to the 1931 CIE chromaticity diagram, but I think largely because the
    green area is "distended" in that one.)

    - Don Klipstein ()
  8. Miles Bader

    Miles Bader Guest

    OpenEXR, at least, seems more than flexible enough to handle future changes:

    + In dynamic range and precision, of course, it far exceeds available
    display technology (using the default 16-bit floating-point channel
    representation; for crazy applications where that's not enough, it
    _also_ allows other representations like 32-bit floating-point, etc...)

    + It allows an arbitrary number of channels to be encoded

    + For the "standard" set of RGB channels, it has a way of specifying the
    chromaticities of the primaries (and has explicitly defined defaults)

    [I wish more software would support openexr well; if you can handle the
    increased size of image files -- it's probably the best image format

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