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private
 
void
 ProcessUsingLockbitsAndUnsafeAndParallel(Bitmap processedBitmap)

        {

            
unsafe


            {

                BitmapData bitmapData 


=
 processedBitmap.LockBits(
new
 Rectangle(
0
, 
0
, processedBitmap.Width, processedBitmap.Height), ImageLockMode.ReadWrite, processedBitmap.PixelFormat);



                
int
 bytesPerPixel 


=
 
System
.Drawing.Bitmap.GetPixelFormatSize(processedBitmap.PixelFormat) 


/
 
8
;

                
int
 heightInPixels 


=
 bitmapData.Height;

                
int
 widthInBytes 


=
 bitmapData.Width 


*
 bytesPerPixel;

                
byte

*
 PtrFirstPixel 


=
 (
byte

*
)bitmapData.Scan0;



                Parallel.For(
0
, heightInPixels, y 


=



>


                {

                    
byte

*
 currentLine 


=
 PtrFirstPixel 


+
 (y 


*
 bitmapData.Stride);

                    
for
 (
int
 x 


=
 
0
; x 


<
 widthInBytes; x 


=
 x 


+
 bytesPerPixel)

                    {

                        
int
 oldBlue 


=
 currentLine[x];

                        
int
 oldGreen 


=
 currentLine[x 


+
 
1
];

                        
int
 oldRed 


=
 currentLine[x 


+
 
2
];



                        currentLine[x] 


=
 (
byte
)oldBlue;

                        currentLine[x 


+
 
1
] 


=
 (
byte
)oldGreen;

                        currentLine[x 


+
 
2
] 


=
 (
byte
)oldRed;

                    }

                });

                processedBitmap.UnlockBits(bitmapData);

            }

        }






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