Public Overloads Sub GetPixelData( _
   ByVal row As Integer, _
   ByVal column As Integer, _
   ByVal data As IntPtr, _
   ByVal dataSize As Integer _
) 

Visual Basic (Usage)	Copy Code
Dim instance As RasterImage Dim row As Integer Dim column As Integer Dim data As IntPtr Dim dataSize As Integer   instance.GetPixelData(row, column, data, dataSize)

public void GetPixelData( 
   int row,
   int column,
   IntPtr data,
   int dataSize
)

public: void GetPixelData( 
   int row,
   int column,
   IntPtr data,
   int dataSize
) 

public:
void GetPixelData( 
   int row,
   int column,
   IntPtr data,
   int dataSize
) 

Parameters

row

The zero-based row number of the pixel.

column

The zero-based column number of the pixel

data

Pointer to unmanaged memory buffer to copy the pixel data to.

dataSize

Size of bytesthe buffer in data.

No transformations are performed on the pixel data.

The pixel data copied may represent an index into an images's palette, a grayscale value ((Document/Medical only), or red, green, and blue color values.

This method should be called only for 8, 16, 24, 32, 48 and 64-bit images. It works as follows:

• For 8-bit images, this method will retrieve the palette index for the specified pixel.
• For 16-bit images, this method will retrieve the 2-byte value that forms the pixel.
  • For grayscale 16-bit images, the data will contain the gray value. LowBit and HighBit properties indicate the valid pixel data.
  • For color 16-bit images, the data contains packed 5-bit R, G and B values. The high bit contains the alpha information. The Order determines whether the data is RGB or BGR.
• For 24-bit images, this method will retrieve the 3 bytes containing the pixel color. The Order determines whether the data is RGB or BGR.
• For 32-bit images, this method will retrieve the 4 bytes containing the pixel color and alpha information. The first 3 bytes contain the pixel color. The The Order determines whether the data in the first 3 bytes is RGB or BGR. The 4th byte is the alpha channel information.
• For 48-bit images, this method will retrieve the 6 bytes containing the pixel color. The Order determines whether the data is RGB or BGR. Each color component is stored as a 16-bit value, where 0 corresponds to black and 0xFFFF corresponds to full white.
• For 64-bit images, this method will retrieve the 8 bytes containing the pixel color and alpha information. The Order determines whether the data in the first 6 bytes is RGB or BGR. Each color component is stored as a 16-bit value, where 0 corresponds to black and 0xFFFF corresponds to full white. The last two bytes contain the alpha information (also stored as a short value).

The minimum size of the returned byte array is calculated:

( + 7) / 8

You can use the SetPixelData method to assign the returned value to another pixel.

This method uses image coordinates to specify the pixel. Therefore, you must account for the view perspective of the image. If you specify a pixel that is outside the image or outside the region (if the image has one), this method throws an exception.

The SetPixelData method changes the data of the specified pixel.

For more information, refer to Processing an Image.

For more information refer to Accounting for View Perspective.

Target Platforms: Microsoft .NET Framework 2.0, Windows 98, Windows NT 4.0, Windows Millennium Edition, Windows 2000, Windows XP Home Edition, Windows XP Professional, Windows Server 2003 family

Reference