diff --git a/lib/PlaYUVerFrame.cpp b/lib/PlaYUVerFrame.cpp
index e3f67f8..720a83e 100644
--- a/lib/PlaYUVerFrame.cpp
+++ b/lib/PlaYUVerFrame.cpp
@@ -343,6 +343,16 @@ PlaYUVerPixel PlaYUVerFrame::getPixelValue( Int xPos, Int yPos, PlaYUVerPixel::C
   return PixelValue;
 }
 
+Void PlaYUVerFrame::setPixelValue( Int xPos, Int yPos, PlaYUVerPixel pixel )
+{
+  for( UInt ch = 0; ch < m_pcPelFormat->numberChannels; ch++ )
+  {
+    Int ratioH = ch > 0 ? m_pcPelFormat->log2ChromaWidth : 0;
+    Int ratioW = ch > 0 ? m_pcPelFormat->log2ChromaHeight : 0;
+    m_pppcInputPel[ch][( yPos >> ratioH )][( xPos >> ratioW )] = pixel.Components()[ch];
+  }
+}
+
 Void PlaYUVerFrame::copyFrom( PlaYUVerFrame* input_frame )
 {
   if( m_iPixelFormat != input_frame->getPelFormat() && m_uiWidth == input_frame->getWidth() && m_uiHeight == input_frame->getHeight() )
diff --git a/lib/PlaYUVerFrame.h b/lib/PlaYUVerFrame.h
index 83d6676..54fb28f 100644
--- a/lib/PlaYUVerFrame.h
+++ b/lib/PlaYUVerFrame.h
@@ -206,6 +206,8 @@ public:
   PlaYUVerPixel getPixelValue( Int xPos, Int yPos );
   PlaYUVerPixel getPixelValue( Int xPos, Int yPos, PlaYUVerPixel::ColorSpace eColorSpace );
 
+  Void setPixelValue( Int xPos, Int yPos, PlaYUVerPixel pixel );
+  
   Void copyFrom( PlaYUVerFrame* );
   Void copyFrom( PlaYUVerFrame*, UInt, UInt );
 
diff --git a/lib/PlaYUVerPixel.cpp b/lib/PlaYUVerPixel.cpp
index 3c32070..2dc3bee 100644
--- a/lib/PlaYUVerPixel.cpp
+++ b/lib/PlaYUVerPixel.cpp
@@ -31,6 +31,42 @@
 namespace plaYUVer
 {
 
+PlaYUVerPixel::PlaYUVerPixel()
+{
+  m_iColorSpace = COLOR_INVALID;
+  PixelComponents[0] = 0;
+  PixelComponents[1] = 0;
+  PixelComponents[2] = 0;
+  PixelComponents[3] = 0;
+}
+
+PlaYUVerPixel::PlaYUVerPixel( Int ColorSpace, Pel c0, Pel c1, Pel c2 )
+{
+  m_iColorSpace = ColorSpace == COLOR_GRAY ? COLOR_YUV : ColorSpace;
+  PixelComponents[0] = c0;
+  PixelComponents[1] = c1;
+  PixelComponents[2] = c2;
+  PixelComponents[3] = 0;
+}
+
+PlaYUVerPixel PlaYUVerPixel::operator+ ( const PlaYUVerPixel& in )
+{
+  PlaYUVerPixel out( m_iColorSpace, Y() + in.Y(), Cb() + in.Cb(), Cr() + in.Cr() );
+  return out;
+}
+
+PlaYUVerPixel PlaYUVerPixel::operator- ( const PlaYUVerPixel& in )
+{
+  PlaYUVerPixel out( m_iColorSpace, Y() - in.Y(), Cb() - in.Cb(), Cr() - in.Cr() );
+  return out;
+}
+
+PlaYUVerPixel PlaYUVerPixel::operator* ( const Double& d )
+{
+  PlaYUVerPixel out( m_iColorSpace, Y() * d, Cb() * d, Cr() * d );
+  return out;
+}
+
 PlaYUVerPixel PlaYUVerPixel::ConvertPixel( ColorSpace eOutputSpace )
 {
   Int outA, outB, outC;
@@ -55,5 +91,5 @@ PlaYUVerPixel PlaYUVerPixel::ConvertPixel( ColorSpace eOutputSpace )
   }
   return outPixel;
 }
-  
+
 }  // NAMESPACE
diff --git a/lib/PlaYUVerPixel.h b/lib/PlaYUVerPixel.h
index db4222c..343add9 100644
--- a/lib/PlaYUVerPixel.h
+++ b/lib/PlaYUVerPixel.h
@@ -73,22 +73,9 @@ public:
     COLOR_ARGB = 3,  //!< RGB + Alpha
   };
 
-  PlaYUVerPixel()
-  {
-    m_iColorSpace = COLOR_INVALID;
-    PixelComponents[0] = 0;
-    PixelComponents[1] = 0;
-    PixelComponents[2] = 0;
-    PixelComponents[3] = 0;
-  }
-  PlaYUVerPixel( Int ColorSpace, Pel c0, Pel c1, Pel c2 )
-  {
-    m_iColorSpace = ColorSpace == COLOR_GRAY ? COLOR_YUV : ColorSpace;
-    PixelComponents[0] = c0;
-    PixelComponents[1] = c1;
-    PixelComponents[2] = c2;
-    PixelComponents[3] = 0;
-  }
+  PlaYUVerPixel();
+  PlaYUVerPixel( Int ColorSpace, Pel c0, Pel c1, Pel c2 );
+  
   Int ColorSpaceType()
   {
     return m_iColorSpace;
@@ -97,6 +84,18 @@ public:
   {
     return PixelComponents;
   }
+  Pel Y() const
+  {
+    return PixelComponents[0];
+  }
+  Pel Cb() const
+  {
+    return PixelComponents[1];
+  }
+  Pel Cr() const
+  {
+    return PixelComponents[2];
+  }
   Pel& Y()
   {
     return PixelComponents[0];
@@ -126,6 +125,10 @@ public:
     return PixelComponents[3];
   }
 
+  PlaYUVerPixel operator+ ( const PlaYUVerPixel& );
+  PlaYUVerPixel operator- ( const PlaYUVerPixel& );
+  PlaYUVerPixel operator* ( const Double& );
+  
   /**
    * Convert a Pixel to a new color space
    * @param inputPixel input pixel (PlaYUVerPixel)