var image/color.GrayModel

4 uses

	image/color (current package)
		color.go#L172: 	GrayModel    Model = ModelFunc(grayModel)

	image
		image.go#L839: func (p *Gray) ColorModel() color.Model { return color.GrayModel }
		image.go#L872: 	p.Pix[i] = color.GrayModel.Convert(c).(color.Gray).Y

	rsc.io/qr
		qr.go#L115: 	return color.GrayModel

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