WindowsShades is a portable screen color adjustment tool to create tinted overlay which can be easily configured by defining the color and opacity. Along with these primary adjustments, it offers many other color-specific settings to overlay specified color on screen for better viewing. According to the developer, it is built for notebook users who need one full-fledged color adjustment application.
For instance, it comes useful for user who goes out frequently with his/her laptop for various purposes and needs to adjust screen color every so often according to the environment color scales. Another useful scenario is when reducing the brightness does not help in late night reading, adding tinted overlay on screen can help when eyes are sore.
After the application is installed, you can launch it from system tray, simple click will overlay screen with green shade. From system tray icon, you can toggle the shade and configure color and opacity.
It offers HSV-based color picker which lets you choose color of your choice, beneath HSV, you have opacity slider to adjust it in a desired way.
In case something goes wrong, it also provides user with multiple pre-defined counter measures. For example, you can press Escape key three times to restore the previous/default settings immediately. It runs on all versions of Windows, testing was done on Windows 7 x86 system.