Does 16 bit per channel display card exist ?

Discussion in 'Photoshop Tutorials' started by John Doe, May 16, 2004.

  1. John Doe

    John Doe Guest

    Meaning that it has at least 16 bit for each of R,G,B channels and can
    actually send them to the display device as opposed to 8 bit that
    consumer level cards have.

    And to continue this question - what about display device ? My
    uneducated guess would be that regular CRT tube based monitor with
    analog input would actually display all that information. I don't know
    enough about how LCD displays with digital inputs work to speculate
    about them.

    As a conclusion - if such device exist, does PhotoShop support it ?
    Can it actually display 65,536 (or even 32,768) shades of R,G,B on the
    screen, not just use 16 bit per channel for the internal image
    repersentation and manipulation ?
     
    John Doe, May 16, 2004
    #1
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  2. I'm not sure: I think that the CRT's circuitry would probably be noisy
    enough to eliminate all of that extra detail, since it isn't designed for
    it.

    Cheers,
    Nicholas Sherlock
     
    Nicholas Sherlock, May 16, 2004
    #2
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  3. John Doe

    Mike Russell Guest

    CT and other medical data has a tremendous dynamic range. To support this,
    there are 12 bit per channel displays that work in grayscale mode, though to
    view them it's normal to have an adjustable "level and window" control,
    similar to the levels command in Photoshop.. I've worked with linear gamma
    10 bit per channel color equipment. As for 16 bit - none that I've heard
    of.
    Probably not. The main advantage would be that you could display linear
    gamma images with no banding in the shadows. Worth it? Probably not.
    No - and it probably will not do so in the near future. I suspect that 9 or
    10 bits might improve things, particularly with one of the newer Adobe RGB
    capable monitors, but for most work you'll never see the difference, unless
    you work in linear gamma.
     
    Mike Russell, May 17, 2004
    #3
  4. John Doe

    Chris Cox Guest

    Not at this time.

    For one thing, the OS display APIs are limited to 8 bits/channel.

    OpenGL should provide for greater depth - but I haven't managed to get
    it through the drivers yet. (I keep trying)

    Also, most displays are only accurate to about 8 bits (CRTs would need
    better electronics, and LCDs would need a lot of work to do more).


    Chris
     
    Chris Cox, May 17, 2004
    #4
  5. John Doe

    Rick Guest

    Oh Dear God, here comes Timo. Run for your lives.

    Rick
     
    Rick, May 17, 2004
    #5
  6. John Doe

    Greg Guest

    I'd take an 8-bit non-linear system over a 10-bit linear system - *14* bits
    of linear encoding is required to match 8-bits non-linear, roughly.

    Greg.
     
    Greg, May 17, 2004
    #6
  7. John Doe

    John Doe Guest

    You are right !!! Why didn't I think of that ? It's so obvious... So
    even if the hardware existed, nothing would probably happen without
    major OS rework
    I am not sure what you mean. I've done a lot of software development
    using OpenGL and don't see how OpenGL is relevant here (even if it was
    - the OpenGL API is also 8bits/channel). Photoshop has nothing to do
    with OpenGL
     
    John Doe, May 18, 2004
    #7
  8. John Doe

    Chris Cox Guest

    OpenGL has APIs for 16 bit/channel images.
    And in theory a graphics card with more than 8 bits/channel in the
    framebuffer could use those APIs to get better than 8 bits/channel
    display.

    There are some cards with 10bit/channel framebuffers - but I can't get
    the drivers to do the right things yet. But I'm still pursuing it.

    Chris
     
    Chris Cox, May 23, 2004
    #8
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