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In gnome-appearance-properties one can choose between none, grayscale and sub-pixel in the font Smoothing category. In fonts.conf one can have e.g.<match target="font" > <edit mode="assign" name="rgba" > <const>unknown</const> </edit> </match>. Unknown can have the values: unknown, rgb, bgr ,vrgb, vbgr, none . Which corresponds to grayscale?

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up vote 3 down vote accepted

none represents grayscale (no colors are used for subpixel rendering).

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