This allows color space conversions that produces values outside the
0.0->1.0 range, which is one of the intended functions of the floating
point image formats.
Change-Id: I63b37b0f6934d4382edafb4709486c785a637c67
Reviewed-by: Laszlo Agocs <laszlo.agocs@qt.io>
Reviewed-by: Eirik Aavitsland <eirik.aavitsland@qt.io>