Monitor Calibration Luminance Profile Question Gretag Eye One

Discussion in 'Photoshop Tutorials' started by Alan Smithee, Sep 3, 2005.

  1. Alan Smithee

    Alan Smithee Guest

    I recently upgraded my Gretag Eye One software to version 3. They now
    recommend I use 100 cd/m2 as the recommended luminance for my CRT monitor.
    First, what is this setting, gamma? and second, how much does this matter in
    the over all scheme of things? Whatever the luminance was before my system
    was calibrated to it and everything seemed to work fine. With this new
    recommendation I notice that my monitor brightness, red, green, and blue
    values have all changed anywhere from 5 to 25%. Should I just go back to
    version 2.0 is the question I'm asking myself. Was this something that was
    broken that they fixed or just a different way of doing things? Thx.
    Alan Smithee, Sep 3, 2005
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  2. Alan Smithee

    John Guest

    No, it's not gamma. If you forgive my loose terminlogy, it is the
    'brightness' of the monitor's white, as set by the CRT's *contrast* control.
    I don't use Gretag myself, but many calibrators simply recommend that you
    wind up the contrast to max and then they measure the luminance.
    Alternatively, you can specify a target (like 100cd/m2) and adjust the
    monitor to conform. The important thing to understand is that it is a
    *hardware* adjustment - it has to be set using the monitor's controls.
    Gretag are simply recommending 100cd/m2 as a target.
    Generally, you want to improve the contrast ratio of the monitor, so the
    brighter you can make it, the better, as long as you don't compromise the
    black point as well. Older CRT's can't always achieve 100cd/m2; perhaps
    Gretag have increased their recommended target due to the general
    improvement of CRT technology, or are assuminng that you use an expensive
    and new one :)
    As I said, I don't use Gretag, but my ColorVision Optical system allows me
    to specify any target luminance I want. I would be surprised if Gretag V3
    doesn't do likewise - if it didn't, there would be a lot of people who could
    not use it, since not all monitors can achieve that target. If you are happy
    with what you had, use it.
    John, Sep 3, 2005
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