monitor corrections

Lindsey Glickfeld's Avatar

Lindsey Glickfeld

08 Nov, 2013 09:50 PM

Hi Chris,

I have some questions about how to perform visual display corrections.

Is there any lookup table that MWorks uses to make gamma corrections, or does it just assume that you've calibrated the monitor locally and use the native settings?

If it is all done natively, is there any way to impose corrections? For instance, I'd like to compensate for the asymmetry of pixel on/off times, which becomes important for stimuli with high temporal frequencies.

Thanks,
Lindsey.

  1. Support Staff 1 Posted by Christopher Sta... on 08 Nov, 2013 10:26 PM

    Christopher Stawarz's Avatar

    Hi Lindsey,

    Is there any lookup table that MWorks uses to make gamma corrections, or does it just assume that you've calibrated the monitor locally and use the native settings?

    MWorks relies on the system color management settings and makes no attempt to alter them.

    If it is all done natively, is there any way to impose corrections?

    To be honest, this is a subject about which I know practically nothing, so I don't think I can provide much of an answer to this question. Can you point me to another piece of software that makes the kind of corrections you want? (For example, do you mean something like this?) That could at least give me some clues as to what's possible and how I might go about making it happen.

    Thanks,
    Chris

  2. 2 Posted by Lindsey Glickfe... on 09 Nov, 2013 05:48 PM

    Lindsey Glickfeld's Avatar

    Chris,

    Yes- that code in psychtoolbox will allow you to set a gamma table to make
    adjustments along the contrast or color axis. There are also cases in
    which you may make corrections along the axis of a different feature like
    TF (in which you adjust the luminance of the stimulus to account for the
    longer off transition for pixels since the error will increase with
    increasing TF). In the past, I've done this manually (by setting
    correction values at specific TFs), but it should/could probably be done
    with a gamma table approach instead.

    I'm not sure how general this issue is and I'm sure other Mworks users have
    come up with solutions. I'll talk a bit more with John and Mark, and then
    come back to you if there's something I need. But the most important thing
    was to know that currently everything is done outside of Mworks.

    Thanks,
    Lindsey.

  3. Christopher Stawarz closed this discussion on 09 Jan, 2014 09:01 PM.

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