I'm shooting a scene for a film where the actor will be placed in front of a computer monitor. I want to use the monitor to light the actor, but I want to be able to adjust the color temperature to get the look I want. I have F.lux (https://justgetflux.com/), so I know changing monitor color temperature is possible, but I want to be able to control it. Preferably the program would be free, and I would be able to adjust the temperature in real time.

  • What do you want to show on the screen?
    – p2or
    Apr 10, 2015 at 19:06
  • 1
    I was planning on using a white image fullscreen, and then being able to adjust the temperature from there. Apr 10, 2015 at 19:07
  • You can use flux to set your monitor temperature manually ... also, what monitor are you using? Mostly all mordern monitors have in-built options to change color saturation, temperature, brightness ... or, even easier, couldn't you just use an orange/red/whatever-colored image in fullscreen mode?
    – MoritzLost
    Apr 10, 2015 at 19:31
  • I have an older AOC monitor, the settings on it aren't very in-depth. The main issue is I want to be able to adjust the temperature live so I can see what it looks like, which is why I want a program. I did look into f.lux settings a little more, and it allow some modification, but I'd like something a little more flexible if anyone knows of something like that. Apr 10, 2015 at 22:24

3 Answers 3


If you can't adjust the monitor, then send it something other than pure white.

@poor already posted an answer to do this with Blender, but that seems like HUGE overkill. I would have just booted Linux, logged in remotely, and done DISPLAY=:0 xsetroot -solid '#fff' to set a solid white background, or any other color I wanted.

And there's probably something you could run to open a fullscreen window with a color of your choice, to save the trouble of switching to a window manager that didn't clutter up the screen borders with stuff. Maybe a screensaver type of program?

I can't think off the top of my head what would give you a GUI color adjuster that would change most of the screen in realtime.

  • Using a seperate OS seems even more overkill than installing a freeware program tbh
    – MoritzLost
    Apr 11, 2015 at 14:41
  • You could additionally mention that it's possible to boot it via usb stick.
    – p2or
    Apr 11, 2015 at 14:46
  • 1
    @Gin-San: If it was a computer I owned, it would already be running Linux :P Obviously go with whatever OS you already use. Apr 12, 2015 at 1:06

Here is a hack. You can use Blender and the Blackbody Node of Cycles Render Engine. Following example shows a realtime viewport animation of the color temperature in kelvin:

enter image description here

  • Create some geometry (e.g. a plane) as light emitter
  • Setup an Emission shader
  • Create a Blackbody node and plug it into the Emission Color
  • Position your camera
  • Switch your Camera by pressing Numpad 0
  • Set the Viewport Shading to Rendered or press F12 to render the image

enter image description here

blend file


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  • Ya, good idea. If you can't adjust the monitor, then send it something other than pure white. Blender seems like HUGE overkill. I would have just booted Linux, logged in remotely, and done DISPLAY=:0 xsetroot -solid '#fff' to set a solid white background. Apr 11, 2015 at 12:32
  • @PeterCordes Thanks Peter. You are right, OP was asking to control it by kelvins and I thought Cycles is physically accurate and have an instant viewport interactivity/rendering, so it could work :) Why not converting your comment into an answer? I would like to upvote it ;)
    – p2or
    Apr 11, 2015 at 12:45
  • sure, why not? :P Apr 11, 2015 at 13:31

Thanks for the other good answers. Here is what I ended up doing.

I created a blank white html page and made it fullscreen, and then used f.lux to adjust the color temperature. It worked for me, but I should point out to anyone looking to use this solution in the future that it isn't perfect. F.lux doesn't give a very broad range of color temperatures. They were enough for my purposes, but someone looking for a very warm or very cool look might not be satisfied. In addition, f.lux changes the color temperature for the entire desktop on all monitors, so if you have something color-sensitive running during the shoot, like using the computer as a monitor, your colors will be off on that as well.

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