Are there Windows softwares that could darken my screens?

Question

I'm using Windows Seven and I'm using two screens, most of the time I get my vision tired when I'm reading because of the lof of white screen. I'd like to know if there is some software that creates a filter in front of the image being exposed by the screen.

When windows asks for administrator permission, it does something like that. The reason for me wanting a software that does that is that I need the transition to be fast, doing it on the buttons of my screen would take a lot of time and configuring Windows to gray won't work because a lot of stuff won't darken (pages in PDF's made with scanned images for example).

Answer 1

First, check your video-adapter’s drivers/control-panel for built-in settings. Like most GPU manufacturers, Nvidia has provided the ability to assign hotkeys to color profiles (figure 1) and likely continues to do so (figure 2).

If not, then there are third-party programs and scripts that can be configured to adjust brightness, contrast, and gamma with hotkeys and/or assign hotkeys to color profiles. One such (free) program is Gamma Panel (figure 3).

(Incidentally, there is a blog post which mentions how you can adjust color of an Nvidia system by manually calling the functions in NvCpl.dll. You could easily assign the commands to standard Windows shortcuts and assign hotkeys to them; unfortunately the post and comments indicate that it only works/worked in Windows XP.)

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Figure 1: Nvidia color-profile hotkeys in Windows XP

Figure 2: Nvidia color-profiles in Windows 7

Figure 3: Gamma Panel