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Redshift is a Linux application similar to Windows' F.lux, which gives the screen a red tinge automatically at night. Supposedly, it reduces eye strain and helps prevent sleep problems.

Is there any way I can adjust my screen's color temperature to create the same effect on Android?

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I use F.lux for Windows and Mac, I love it. It's funny that you asked this, just last night I was wondering if F.lux existed for Android... –  travis Feb 10 '11 at 4:25
    
Very similar question here: android.stackexchange.com/questions/5830/… –  Al E. Feb 10 '11 at 14:35
    
As a sidenote, here's a question about the claims of F.lux and Redshift at Skeptics StackExchange: "Does the color temperature of a computer screen affect sleep patterns?" –  Ilari Kajaste Oct 24 '11 at 18:25

9 Answers 9

up vote 4 down vote accepted
+100

Would Color Filter Service fit your needs? There's a half-screen demo available in the Market that you can try out as well. You can tweak the RGB values of the filter however you want, so if you want a red filter just crank up the red slider and don't adjust the G/B values.

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that the one :) thx –  david25 Feb 18 '11 at 22:29

Well I know for a fact that there is Cyanogenmod ROM which has "filter options" one of them being only turn on red, I know its not automatic, but there is widgets for the home screen. I'm pretty sure there is a way to do it by app but it would require root access.

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Tasker or Locale could probably turn it on, but I'm guessing a gradual change wouldn't be possible. –  Matthew Read Feb 18 '11 at 17:56
    
unfotunatly when selected it completely turns off all other colors –  Mehran Feb 18 '11 at 23:23
    
Sorry, but I could not find that setting (CYM11 here). Where's that? –  Luis A. Florit Oct 2 at 15:18

NeyetLight looks like it would do the trick.

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You can try the Screen Filter app.

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Gee whiz, man! Give us a link! –  Al E. Feb 10 '11 at 4:01
    
unfortunately it's a no go but thanks for recommendation –  david25 Feb 10 '11 at 4:06
    
Is it just the color? Maybe you could ask the dev to add color selection. –  Matthew Read Feb 10 '11 at 4:28
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yeah it's the color , regular LCD color makes your brain think its in sunlight and keeps you awake , more red color suppose to prevent that, i will try reaching the dev thx for the tip –  david25 Feb 10 '11 at 4:48

I dont know if this will help but there is an app in the market named "screen adjuster" by NETMAN that allows you to control the red tint on the phone

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Twilight works well, although it's just a screen filter, it's automated and very similar to f.lux if you move the color temp to the right more

I love it although it does look terrible, it's all we have, and I am not going to root my phone just to have a true color temp change that's insane, plus it voids my warranty which I need to have and rooting is insanely difficult, DO NOT tell me it's easy i've read the instructions for it -- it's NOT EASY

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Methods I know of that do change the color of the screen require flashing a custom kernel. I don't know of one that purposely makes the color less accurate, however. One kernel for Galaxy S phones is called Voodoo Color. If you're a developer, I suggest contacting them and asking how you could do it; otherwise you'd probably need to hire someone.

Edit: Apparently this can be done through an app, I had no idea. Still, this is an option.

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actually i searched real hard and got to this:blueprints.launchpad.net/redshift/+spec/droid-shift i don't think its possible in android 2.1, if anyone will have a workaround for that it will be a pleasant surprise,i know from what i read CyanogenMod have something similar as default feature, will check if it is possible to update my nook into that –  david25 Feb 10 '11 at 4:22

It doesn't provide red tint, but for late night, ultra-dim reading I use adjBrightness. It does require a rooted device.

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ChainFire3d can do this, but requires ROOT.

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