Copies the pixel data of the specified pixel into an unmanaged memory buffer.
Public Overloads Sub GetPixelData( _
ByVal row As Integer, _
ByVal column As Integer, _
ByVal data As IntPtr, _
ByVal dataSize As Integer _
)
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 bytes the buffer in data.
The image memory must be locked when you use this method. Normally, you can call Access to lock the memory before starting an operation that uses this method. Then call Release when the operation is finished.
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:
The minimum size of the returned byte array is calculated:
(BitsPerPixel + 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 Introduction to Image Processing With LEADTOOLS.
For more information refer to Accounting for View Perspective.
This example uses the GetPixelData and SetPixelData methods to swap the R and G values for a particular pixel.
using Leadtools;
using Leadtools.Codecs;
using Leadtools.ImageProcessing;
using Leadtools.ImageProcessing.Core;
using Leadtools.ImageProcessing.Color;
using Leadtools.Dicom;
using Leadtools.Drawing;
using Leadtools.Controls;
using LeadtoolsExamples.Common;
using Leadtools.Svg;
public void GetPixelDataExample()
{
RasterCodecs codecs = new RasterCodecs();
// Load the image
RasterImage image = codecs.Load(Path.Combine(ImagesPath.Path, "IMAGE1.CMP"));
if (image.BitsPerPixel == 24)
{
byte[] Data;
byte Value;
int Row = 10, Column = 20;
image.Access();
Data = image.GetPixelData(Row, Column);
// swap the R and B values
Value = Data[0]; Data[0] = Data[2]; Data[2] = Value;
// put back the transformed pixel
image.SetPixelData(Row, Column, Data);
image.Release();
}
codecs.Save(image, Path.Combine(ImagesPath.Path, "IMAGE1_GetPixelData.BMP"), RasterImageFormat.Bmp, 0);
image.Dispose();
codecs.Dispose();
}
Imports Leadtools
Imports Leadtools.Codecs
Imports Leadtools.ImageProcessing
Imports Leadtools.ImageProcessing.Core
Imports Leadtools.ImageProcessing.Color
Imports Leadtools.Controls
Imports Leadtools.Dicom
Imports Leadtools.Drawing
Imports Leadtools.Svg
Public Sub GetPixelDataExample()
Dim codecs As RasterCodecs = New RasterCodecs()
' Load the image
Dim image As RasterImage = codecs.Load(Path.Combine(LEAD_VARS.ImagesDir, "IMAGE1.CMP"))
If image.BitsPerPixel = 24 Then
Dim Data As Byte()
Dim Value As Byte
Dim Row As Integer = 10, Column As Integer = 20
image.Access()
Data = image.GetPixelData(Row, Column)
' swap the R and B values
Value = Data(0)
Data(0) = Data(2)
Data(2) = Value
' put back the transformed pixel
image.SetPixelData(Row, Column, Data)
image.Release()
End If
codecs.Save(image, Path.Combine(LEAD_VARS.ImagesDir, "IMAGE1_GetPixelData.BMP"), RasterImageFormat.Bmp, 0)
image.Dispose()
codecs.Dispose()
End Sub
Public NotInheritable Class LEAD_VARS
Public Const ImagesDir As String = "C:\Users\Public\Documents\LEADTOOLS Images"
End Class
c#[Silverlight C# Example]
using Leadtools;
using Leadtools.Codecs;
using Leadtools.Dicom;
using Leadtools.ImageProcessing;
using Leadtools.ImageProcessing.Core;
using Leadtools.ImageProcessing.Color;
using Leadtools.Examples;
using Leadtools.Windows.Media;
public void GetPixelDataExample(RasterImage image, Stream destStream)
{
if (image.BitsPerPixel == 24)
{
byte[] Data;
byte Value;
int Row = 10, Column = 20;
image.Access();
Data = image.GetPixelData(Row, Column);
// swap the R and B values
Value = Data[0]; Data[0] = Data[2]; Data[2] = Value;
// put back the transformed pixel
image.SetPixelData(Row, Column, Data);
image.Release();
}
RasterCodecs codecs = new RasterCodecs();
codecs.Save(image, destStream, RasterImageFormat.Bmp, 0);
image.Dispose();
}
vb[Silverlight VB Example]
Imports Leadtools
Imports Leadtools.Codecs
Imports Leadtools.Dicom
Imports Leadtools.ImageProcessing
Imports Leadtools.ImageProcessing.Core
Imports Leadtools.ImageProcessing.Color
Imports Leadtools.Windows.Media
Public Sub GetPixelDataExample(ByVal image As RasterImage, ByVal destStream As Stream)
If image.BitsPerPixel = 24 Then
Dim Data As Byte()
Dim Value As Byte
Dim Row As Integer = 10, Column As Integer = 20
image.Access()
Data = image.GetPixelData(Row, Column)
' swap the R and B values
Value = Data(0)
Data(0) = Data(2)
Data(2) = Value
' put back the transformed pixel
image.SetPixelData(Row, Column, Data)
image.Release()
End If
Dim codecs As RasterCodecs = New RasterCodecs()
codecs.Save(image, destStream, RasterImageFormat.Bmp, 0)
image.Dispose()
End Sub
Help Collections
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