Leadtools Namespace > RasterImage Class > GetPixelData Method : GetPixelData(Int32,Int32) Method |
'Declaration Public Overloads Function GetPixelData( _ ByVal row As Integer, _ ByVal column As Integer _ ) As Byte()
'Usage Dim instance As RasterImage Dim row As Integer Dim column As Integer Dim value() As Byte value = instance.GetPixelData(row, column)
public: array<byte>^ GetPixelData( int row, int column )
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.
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(Int32,Int32,Byte[]) 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(Int32,Int32,Byte[]) 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.
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 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) 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
public void GetPixelDataExample() { RasterCodecs codecs = new RasterCodecs(); // Load the image RasterImage image = codecs.Load(Path.Combine(LEAD_VARS.ImagesDir, "IMAGE1.CMP")); if(image.BitsPerPixel == 24) { byte[] Data; byte Value; int Row = 10, Column = 20; 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); } codecs.Save(image, Path.Combine(LEAD_VARS.ImagesDir, "IMAGE1_GetPixelData.BMP"), RasterImageFormat.Bmp, 0); image.Dispose(); codecs.Dispose(); } static class LEAD_VARS { public const string ImagesDir = @"C:\Users\Public\Documents\LEADTOOLS Images"; }
RasterImageExamples.prototype.GetPixelDataExample = function () { Tools.SetLicense(); with (Leadtools) { with (Leadtools.Codecs) { var codecs = new RasterCodecs(); // Load the image var srcFileName = "Assets\\Image1.cmp"; var image; return Tools.AppInstallFolder().getFileAsync(srcFileName).then(function (loadFile) { return codecs.loadAsync(LeadStreamFactory.create(loadFile)) }) .then(function (img) { image = img; if (image.bitsPerPixel === 24) { var Data; var Value; var Row = 10, Column = 20; 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); } return Tools.AppLocalFolder().createFileAsync("IMAGE1_GetPixelData.BMP") }) .then(function (saveFile) { var saveStream = LeadStreamFactory.create(saveFile); return codecs.saveAsync(image, saveStream, RasterImageFormat.bmp, 24) }) .then(function () { image.close(); codecs.close(); }); } } }
[TestMethod] public async Task GetPixelDataExample() { RasterCodecs codecs = new RasterCodecs(); // Load the image string srcFileName = @"Assets\Image1.cmp"; StorageFile loadFile = await Tools.AppInstallFolder.GetFileAsync(srcFileName); RasterImage image = await codecs.LoadAsync(LeadStreamFactory.Create(loadFile)); if (image.BitsPerPixel == 24) { byte[] Data; byte Value; int Row = 10, Column = 20; 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); } StorageFile saveFile = await Tools.AppLocalFolder.CreateFileAsync("IMAGE1_GetPixelData.BMP"); ILeadStream saveStream = LeadStreamFactory.Create(saveFile); await codecs.SaveAsync(image, saveStream, RasterImageFormat.Bmp, 24); image.Dispose(); codecs.Dispose(); }
public void GetPixelDataExample(RasterImage image, Stream destStream) { if (image.BitsPerPixel == 24) { byte[] Data; byte Value; int Row = 10, Column = 20; 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); } RasterCodecs codecs = new RasterCodecs(); codecs.Save(image, destStream, RasterImageFormat.Bmp, 0); image.Dispose(); }
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
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)
End If
Dim codecs As RasterCodecs = New RasterCodecs()
codecs.Save(image, destStream, RasterImageFormat.Bmp, 0)
image.Dispose()
End Sub
Target Platforms: Windows 7, Windows Vista SP1 or later, Windows XP SP3, Windows Server 2008 (Server Core not supported), Windows Server 2008 R2 (Server Core supported with SP1 or later), Windows Server 2003 SP2