Emgu CV Library Documentation
SubR Method
NamespacesEmgu.CVImage<(Of <(TColor, TDepth>)>)SubR()()()

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SubR(TColor)
result = val - this

SubR(TColor, Image<(Of <(Gray, Byte>)>))
result = val - this, using a mask

Assembly: Emgu.CV (Module: Emgu.CV) Version: 1.5.0.0 (1.5.0.0)