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Can't recommend this enough.

However, I forget it's on at night. When editing images and colors for webpages, I always go insane the next day when I forgot to turn f.lux off and all the colors are completely off.

edit: also, direct link - http://stereopsis.com/flux/

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Yeah, it's not ideal for colour-sensitive graphic work like that. I'm a coder, so when I picked this up a few months ago it was wonderful.

The only issue I have is that it locks up the entire computer while it fades gamma down at sunset, and again at sunrise. Maybe that's intentional, to let you know that sunset's arrived?

From the FAQ: "Q. This changes too fast, it always shocks me. A. The f.lux transition can be CPU intensive, so f.lux tries to be polite about it. To make it slow, you can use the special 1-hour slow transition option under settings instead."

That's a nice option to turn on.

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