Load(Stream,LeadRect) Method

C#
Visual Basic
WinRT C#
Java
Objective-C
WinRT JavaScript
C++

public RasterImage Load( 
   Stream stream,
   LeadRect tile
)

'Declaration

Public Overloads Function Load( _
   ByVal stream As Stream, _
   ByVal tile As LeadRect _
) As RasterImage

'Usage

Dim instance As RasterCodecs
Dim stream As Stream
Dim tile As LeadRect
Dim value As RasterImage
 
value = instance.Load(stream, tile)

public RasterImage Load( 
   Stream stream,
   LeadRect tile
)

public RasterImage load(ILeadStream stream, LeadRect tile)

 function Leadtools.Codecs.RasterCodecs.Load(Stream,LeadRect)( 
   stream ,
   tile 
)

public:
RasterImage^ Load( 
   Stream^ stream,
   LeadRect tile
)

Parameters

stream: A Stream containing the image data to load.
tile: A LeadRect describing the tile/area of the image to load.

Return Value

The RasterImage object that this method loads.

This method loads a section of an image stream (any format). The section begins is defined by tile rectangle.

LEADTOOLS will attempt to load corrupted files so you can see at least a portion of the image. For these images, the load methods succeed, but LoadStatus will return an error code.

Use the CodecsLoadOptions class to set up other load option parameters before calling this method.

Support for 12 and 16-bit grayscale, and 48 and 64-bit color images is only available in the Document/Medical Imaging editions.

For supported formats, refer to Summary of All Supported Image File Formats.

LEADTOOLS loads all PDF files as Raster PDF uncompressed RasterImageFormat.RasPdf, regardless of the compression and color space used when saving the file.

The CodecsLoadOptions.AllPages property controls whether RasterCodecs will try to load all pages or just the first page if the image data contains multiple pages.

This example will create a rectangle area from a stream containing image data.

C#
Visual Basic
WinRT C#
WinRT JavaScript
Silverlight C#
Silverlight VB

Copy Code

Imports Leadtools
Imports Leadtools.Codecs
Imports Leadtools.ImageProcessing
Imports Leadtools.ImageProcessing.Color
Imports Leadtools.Drawing
Imports Leadtools.Svg

      
Public Sub LoadTileStream1Example()
   Dim codecs As RasterCodecs = New RasterCodecs()
   Dim srcFileName As String = Path.Combine(LEAD_VARS.ImagesDir, "Image1.cmp")
   Dim destFileName As String = Path.Combine(LEAD_VARS.ImagesDir, "Image1_LoadTileStream1.bmp")

   Dim fs As FileStream = File.OpenRead(srcFileName)

   ' Get the image dimension
   Dim info As CodecsImageInfo = codecs.GetInformation(fs, False)

   ' Load the lower right corner of the image
   Dim rc As LeadRect = New LeadRect(info.Width \ 2, info.Height \ 2, info.Width \ 2, info.Height \ 2)

   Dim image As RasterImage = codecs.Load(fs, rc)
   fs.Close()

   Debug.Assert(image.Width = (info.Width \ 2))
   Debug.Assert(image.Height = (info.Height \ 2))

   ' Save this image back to disk
   codecs.Save(image, destFileName, RasterImageFormat.Bmp, 24)
   image.Dispose()

   ' Clean up
   codecs.Dispose()
End Sub

Public NotInheritable Class LEAD_VARS
Public Const ImagesDir As String = "C:\Users\Public\Documents\LEADTOOLS Images"
End Class

using Leadtools;
using Leadtools.Codecs;
using Leadtools.ImageProcessing;
using Leadtools.ImageProcessing.Color;
using Leadtools.Svg;

      
public void LoadTileStream1Example()
{
   RasterCodecs codecs = new RasterCodecs();
   string srcFileName = Path.Combine(LEAD_VARS.ImagesDir, "Image1.cmp");
   string destFileName = Path.Combine(LEAD_VARS.ImagesDir, "Image1_LoadTileStream1.bmp");

   FileStream fs = File.OpenRead(srcFileName);

   // Get the image dimension
   CodecsImageInfo info = codecs.GetInformation(fs, false);

   // Load the lower right corner of the image
   LeadRect rc = new LeadRect(
      info.Width / 2,
      info.Height / 2,
      info.Width / 2,
      info.Height / 2);

   RasterImage image = codecs.Load(fs, rc);
   fs.Close();

   Debug.Assert(image.Width == (info.Width / 2));
   Debug.Assert(image.Height == (info.Height / 2));

   // Save this image back to disk
   codecs.Save(image, destFileName, RasterImageFormat.Bmp, 24);
   image.Dispose();

   // Clean up
   codecs.Dispose();
}

static class LEAD_VARS
{
public const string ImagesDir = @"C:\Users\Public\Documents\LEADTOOLS Images";
}

using Leadtools;
using Leadtools.Codecs;
using Leadtools.Examples;
using Leadtools.ImageProcessing;
using Leadtools.ImageProcessing.Color;
using Leadtools.Windows.Media;

public void LoadTileStream1Example(Stream inStreamCmp, Stream outStreamBmp)
{
   RasterCodecs codecs = new RasterCodecs();
   // Get the image dimension
   CodecsImageInfo info = codecs.GetInformation(inStreamCmp, false);

   // Load the lower right corner of the image
   LeadRect rc = new LeadRect(info.Width / 2, info.Height / 2, info.Width / 2, info.Height / 2);

   RasterImage image = codecs.Load(inStreamCmp, rc);
   Debug.Assert(image.Width == (info.Width / 2));
   Debug.Assert(image.Height == (info.Height / 2));

   // Save this image back to disk
   codecs.Save(image, outStreamBmp, RasterImageFormat.Bmp, 24);
   image.Dispose();
}

Imports Leadtools
Imports Leadtools.Codecs
Imports Leadtools.ImageProcessing
Imports Leadtools.ImageProcessing.Color
Imports Leadtools.Windows.Media

Public Sub LoadTileStream1Example(ByVal inStreamCmp As Stream, ByVal outStreamBmp As Stream)
   Dim codecs As RasterCodecs = New RasterCodecs()
   ' Get the image dimension
   Dim info As CodecsImageInfo = codecs.GetInformation(inStreamCmp, False)

   ' Load the lower right corner of the image
   Dim rc As LeadRect = New LeadRect(info.Width / 2, info.Height / 2, info.Width / 2, info.Height / 2)

   Dim image As RasterImage = codecs.Load(inStreamCmp, rc)
   Debug.Assert(image.Width = (info.Width / 2))
   Debug.Assert(image.Height = (info.Height / 2))

   ' Save this image back to disk
   codecs.Save(image, outStreamBmp, RasterImageFormat.Bmp, 24)
   image.Dispose()
End Sub

Target Platforms

Reference

RasterCodecs Class
RasterCodecs Members
Overload List
Loading and Saving Images
Loading and Saving Large TIFF / BigTIFF Files
Speeding Up 1-Bit Documents
Fast File Info