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I want to toogle my screen colors (for example with keyboard shortcut) between normal and inverted+grayscale. xcalib -i -a does what I need to invert them, but does not seem to be capable for making them grayscale. The answer from https://unix.stackexchange.com/questions/125257/how-can-i-make-the-screen-black-and-white suggests that I need to change the configuration file, but how to make it as toggle?

The ideal behaviour for color changes should look like: Normal colors Inverted colors + grayscale colors

Bonus: To get it even more useful I would like to apply these color changes only for specific window (web browser, word processor, etc).

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Jānis Erdmanis
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    Possible duplicate of [Setting a greyscale (or monochrome) color scheme](http://askubuntu.com/questions/102440/setting-a-greyscale-or-monochrome-color-scheme) – Zanna Jul 08 '16 at 07:08
  • Do you have an Nvidia graphics adapter? If so, we could build on one of the answers of the [Unix.SE] question you're linking. – David Foerster Jul 11 '16 at 08:13
  • You can do this in Evince with Ctrl+I, if your main concern is pdf files. – Luís de Sousa Jul 13 '16 at 12:39

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