www.emgu.com/wiki
Elementwise add img1 with val

Declaration Syntax
public static Image<TColor, TDepth> operator +(
Image<TColor, TDepth> img1,
double val
)
Public Shared Operator + ( _
img1 As Image(Of TColor, TDepth), _
val As Double _
) As Image(Of TColor, TDepth)
public:
static Image<TColor, TDepth>^ operator +(
Image<TColor, TDepth>^ img1,
double val
)

Return Value
The images plus the color
Assembly:
Emgu.CV (Module: Emgu.CV) Version: 1.3.0.0 (1.3.0.0)