Best way to grey out a status item's image?

[Gabriel Zachmann via Cocoa-dev]

My status item uses an image as icon like this:

        let itemImage = NSImage(named: "schinkel_icon")
        itemImage?.isTemplate = false
        statusBarItem_.button?.image = itemImage

I would like to make this image grey (usually it is colorful)
in cases when the status item is paused.

What would be the best way to do that?
Should I just replace the icon at runtime with a grayish image?

Best regards, Gabriel

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