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Re:Going gray for smartphone addiction by yumaikas on Monday January 15, 2018 @01:28PM (#16152361)
For windows users, there's stuff like http://arcanesanctum.net/negativescreen/, that might be interesting to investigate and/or integrate into this.
Re:Going gray for smartphone addiction by xaedes on Wednesday January 17, 2018 @01:52AM (#16166000)
I missed the grayscale option at first sight and discarded that solution. Thought it could only invert colors.

To make it clear: NegativeScreen has a grayscale option with default hotkey F11.