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Thread: Moving light lines on dark background

  1. #1
    Junior Member Newbie
    Join Date
    Mar 2011
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    2

    Moving light lines on dark background

    Hello!
    I have some problem with rather simple 2-D OpenGL scenes. There is some number of lines, for example, on a background (which filled with glClear). When I drag mouse, I "move" scene, recalculating translation and repainting. If background is bright (white, for ex.) and lines are dark (black, for ex.), all OK. On the contrary if lines are light and background is dark when I drag the scene lines becomes much darker, being almost invisible. When I stop dragging they recover immideately.
    Does somebody knows what can it be?
    Yury

  2. #2
    Super Moderator OpenGL Lord
    Join Date
    Dec 2003
    Location
    Grenoble - France
    Posts
    5,574

    Re: Moving light lines on dark background

    Yeah, stop using a crappy LCD screen. Try any CRT instead !

    Seriously, this ghosting effect is caused by the (slow) non linear response of liquid crystals. Recent screens sometimes have an "overdrive" system to force crystals to change state faster... but sometimes is it tuned too high, and you see reverse-ghosting when dark-grey moves aside light-grey for example.

    Try to find an LCD screen with user-tunable overdrive !
    For example you can read this for enlightenment :
    http://www.bit-tech.net/hardware/mon...of-overdrive/1

  3. #3
    Junior Member Newbie
    Join Date
    Mar 2011
    Posts
    2

    Re: Moving light lines on dark background

    Thanks much for an answer and explanation.
    Yury

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