Now you mention the the screen is inverted every 6 hours. I think you are doing this based on the position of the sun (light versus dark) rather than a step toward preventing screen burn in. And while a change every 12 hours is certainly better than nothing at all, screen burn in will be noticeable after about a year of leaving the Mac switching on 24/7 this way.

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I guess I'm confused on the nature of burn-in, then. I thought that the problem was caused by pixels on the screen being illuminated unevenly for extended periods of time, not by the length of time that a pixel is kept on. The 12-hour inversion is intended to account for that. (And yeah, it makes for a cool day/night indicator, but 0600 and 1800 were picked for a reason.)

If I understand you correctly, you're saying that it's not a relative effect -- that if you left the whole screen blank white for an extended period you'd be causing damage, even if you didn't notice it relative to the other pixels? In that case, you're shortening the life of the monitor by using the system at all, aren't you?

But if there could be a feature added to allow more rapid screen inversion, then it would be a step toward protecting the CRT a bit better. Even so, thank you for the work on this great classic Mac app!

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I have no objection to that. I was hoping to avoid a prefs dialog, though, but it may be about time. [] ]'>

Thanks for the kind words.

- Aaron