www.emgu.com/wiki Elementwise subtrace a color from the current image

Declaration Syntax
public Image<TColor, TDepth> Sub(
TColor val
)
Public Function Sub ( _
val As TColor _
) As Image(Of TColor, TDepth)
public:
Image<TColor, TDepth>^ Sub(
TColor val
)

Parameters
- val (TColor)
- The color value to be subtraced from the current image

Return Value
The result of elementwise subtracting color 'val' from the current image
Assembly:
Emgu.CV (Module: Emgu.CV) Version: 1.3.0.0 (1.3.0.0)