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This is a property used often in black and white conversions from a colour image. You’ll find it in programs like Silver Efex Pro, Capture One and others, and it changes the way different colours are converted into shades of grey. For example, you can use it to mimic the effect of a red filter in black and white photography, by reducing the strength (sensitivity) of the blue/cyan colours in the image and increasing the strength of the red/orange tones. In the old days, you’d use the Channel Mixer in Photoshop to achieve the same thing in a cruder fashion; these days, black and white conversion tools offer more control over a wider range of colours.