$gray
$gray : integer
Gray value.
Gray color.
toRgb() : \BaconQrCode\Renderer\Color\Rgb
toRgb(): defined by ColorInterface.
toCmyk() : \BaconQrCode\Renderer\Color\Cmyk
toCmyk(): defined by ColorInterface.
toGray() : \BaconQrCode\Renderer\Color\Gray
toGray(): defined by ColorInterface.
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