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I would like to temporarily turn my screen gray, to estimate how certain images would appear if printed with a black-and-white printer. I think xcalib could do it but I don't know how. Does anyone know how to get the desired effect?

For instance, to view inverted colors, I run xcalib -invert -alter to toggle the effect and it works great. Is there a similar way to get a grayscale screen?

mmdanziger
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  • You won't believe it, but we already have an answer even for this: http://askubuntu.com/questions/102440/setting-a-greyscale-or-monochrome-color-scheme :) – falconer Jan 15 '14 at 12:43

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