[oVeRmInD911]

I'm thinking of making a program that will change the screen brightness and contrast with the time of the day. That way, you can make it so at night it will be less bright and during the day it will be more bright. Is there any way to change it, or will I have to manually change them every day?

[Chuckit]

Originally posted by oVeRmInD911:
I'm thinking of making a program that will change the screen brightness and contrast with the time of the day. That way, you can make it so at night it will be less bright and during the day it will be more bright. Is there any way to change it, or will I have to manually change them every day?

I'm not sure how much skill you have in what areas, but CoreGraphics has functions for this.

[arekkusu]

Specifically, CGSetDisplayTransferByTable().

see the Apple sample code:
http://developer.apple.com/samplecod...2D/CGGamma.htm

[Rickster]

That actually changes the picture gamma curve... I think Overmind is asking about how to control the brightness of the display's backlight lamp, doing the same thing as the Brightness slider in the Display pane of System Prefs.

As for how to do the latter, I have no idea... Never had a need to look for myself. But you might still find it by poking about in CoreGraphics headers... or you may need to look around at the IOKit level, since that's a hardware thing.