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Load(Stream,Rectangle,Int32,CodecsLoadByteOrder,Int32,Int32) Method
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Leadtools.Codecs Namespace > RasterCodecs Class > Load Method : Load(Stream,Rectangle,Int32,CodecsLoadByteOrder,Int32,Int32) Method




stream
A Stream containing the image data to load.
tile
A Rectangle describing the tile/area of the image to load.
bitsPerPixel

Resulting image pixel depth. Valid values are:

valuemeaning
0Keep the original file's pixel depth (Do not convert).
1 to 8The specified bits per pixel in the resulting image.
1212 bits per pixel in the resulting image.
1616 bits per pixel in the resulting image.
2424 bits per pixel in the resulting image.
3232 bits per pixel in the resulting image.
4848 bits per pixel in the resulting image.
6464 bits per pixel in the resulting image.

order

Color order for 16-, 24-, 32-, 48-, and 64-bit images. If the resulting image is less than 16 bits per pixel, this will have no effect since palletized images have no order. The following are valid values.

ValueMeaning
CodecsLoadByteOrder.RgbRed, green, and blue color order in memory
CodecsLoadByteOrder.BgrBlue, green, and red color order in memory
CodecsLoadByteOrder.Gray12 or 16-bit grayscale image. 12 and 16-bit grayscale images are only supported in the Document/Medical Imaging editions.
CodecsLoadByteOrder.RgbOrGrayLoad the image as red, green, blue OR as a 12 or 16-bit grayscale image. 12 and 16-bit grayscale images are supported in the Document/Medical Imaging editions
CodecsLoadByteOrder.BgrOrGrayLoad the image as blue, green, red OR as a 12 or 16-bit grayscale image. 12 and 16-bit grayscale images are supported in the Document/Medical Imaging editions
CodecsLoadByteOrder.RommROMM order. ROMM only supports 24 and 48-bit images
CodecsLoadByteOrder.BgrOrGrayOrRommLoad the image as red, green, blue OR as a 12 or 16-bit grayscale image OR as ROMM. 12 and 16-bit grayscale images are supported in the Document/Medical Imaging editions only. ROMM only supports 24 and 48-bit color images.

firstPage
1-based index of the first page to load.
lastPage
The 1-based index of the last page to load. Must be greater than or equal to firstPage. You can pass -1 to load from firstPage to the last page in the file.
Loads the specified rectangle from the specified image stream using the specified options.

Syntax

Visual Basic (Declaration) 
Overloads Public Function Load( _
   ByVal stream As Stream, _
   ByVal tile As Rectangle, _
   ByVal bitsPerPixel As Integer, _
   ByVal order As CodecsLoadByteOrder, _
   ByVal firstPage As Integer, _
   ByVal lastPage As Integer _
) As RasterImage
Visual Basic (Usage)Copy Code
Dim instance As RasterCodecs
Dim stream As Stream
Dim tile As Rectangle
Dim bitsPerPixel As Integer
Dim order As CodecsLoadByteOrder
Dim firstPage As Integer
Dim lastPage As Integer
Dim value As RasterImage
 
value = instance.Load(stream, tile, bitsPerPixel, order, firstPage, lastPage)
C# 
public RasterImage Load( 
   Stream stream,
   Rectangle tile,
   int bitsPerPixel,
   CodecsLoadByteOrder order,
   int firstPage,
   int lastPage
)
Managed Extensions for C++ 
public: RasterImage Load( 
   Stream* stream,
   Rectangle tile,
   int bitsPerPixel,
   CodecsLoadByteOrder order,
   int firstPage,
   int lastPage
)
C++/CLI 
public:
RasterImage Load( 
   Stream^ stream,
   Rectangle tile,
   int bitsPerPixel,
   CodecsLoadByteOrder order,
   int firstPage,
   int lastPage
)

Parameters

stream
A Stream containing the image data to load.
tile
A Rectangle describing the tile/area of the image to load.
bitsPerPixel

Resulting image pixel depth. Valid values are:

valuemeaning
0Keep the original file's pixel depth (Do not convert).
1 to 8The specified bits per pixel in the resulting image.
1212 bits per pixel in the resulting image.
1616 bits per pixel in the resulting image.
2424 bits per pixel in the resulting image.
3232 bits per pixel in the resulting image.
4848 bits per pixel in the resulting image.
6464 bits per pixel in the resulting image.

order

Color order for 16-, 24-, 32-, 48-, and 64-bit images. If the resulting image is less than 16 bits per pixel, this will have no effect since palletized images have no order. The following are valid values.

ValueMeaning
CodecsLoadByteOrder.RgbRed, green, and blue color order in memory
CodecsLoadByteOrder.BgrBlue, green, and red color order in memory
CodecsLoadByteOrder.Gray12 or 16-bit grayscale image. 12 and 16-bit grayscale images are only supported in the Document/Medical Imaging editions.
CodecsLoadByteOrder.RgbOrGrayLoad the image as red, green, blue OR as a 12 or 16-bit grayscale image. 12 and 16-bit grayscale images are supported in the Document/Medical Imaging editions
CodecsLoadByteOrder.BgrOrGrayLoad the image as blue, green, red OR as a 12 or 16-bit grayscale image. 12 and 16-bit grayscale images are supported in the Document/Medical Imaging editions
CodecsLoadByteOrder.RommROMM order. ROMM only supports 24 and 48-bit images
CodecsLoadByteOrder.BgrOrGrayOrRommLoad the image as red, green, blue OR as a 12 or 16-bit grayscale image OR as ROMM. 12 and 16-bit grayscale images are supported in the Document/Medical Imaging editions only. ROMM only supports 24 and 48-bit color images.

firstPage
1-based index of the first page to load.
lastPage
The 1-based index of the last page to load. Must be greater than or equal to firstPage. You can pass -1 to load from firstPage to the last page in the file.

Return Value

The RasterImage object that this method loads.

Example

Visual BasicCopy Code
RasterCodecs.Load(Stream, Rectangle, int, CodecsLoadByteOrder, int, int)
      Public Sub LoadTileStream2Example()
         RasterCodecs.Startup()
         Dim codecs As RasterCodecs = New RasterCodecs()

         Dim srcFileName As String = "C:\Program Files\LEAD Technologies\LEADTOOLS 15\Images\Eye.gif"
         Dim destFileName As String = "C:\Program Files\LEAD Technologies\LEADTOOLS 15\Images\Image1_LoadTileStream2.bmp"

         Dim fs As FileStream = File.OpenRead(srcFileName)

         ' Get the image dimension
         Dim pageNumber As Integer = 2
         Dim info As CodecsImageInfo = codecs.GetInformation(fs, True, pageNumber)

         ' Load the middle portion of the page
         Dim width As Integer = info.Width \ 3
         Dim height As Integer = info.Height \ 3
         Dim rc As Rectangle = New Rectangle((info.Width - width) \ 2, (info.Height - height) \ 2, width, height)

         Dim image As RasterImage = codecs.Load(fs, rc, 1, CodecsLoadByteOrder.Rgb, 2, 2)
         fs.Close()

         Debug.Assert(image.PageCount = 1)
         Debug.Assert(image.Width = rc.Width)
         Debug.Assert(image.Height = rc.Height)

         ' Save this image back to disk
         codecs.Save(image, destFileName, RasterImageFormat.Bmp, 1)
         image.Dispose()

         ' Clean up
         codecs.Dispose()
         RasterCodecs.Shutdown()
      End Sub
C#Copy Code
RasterCodecs.Load(Stream, Rectangle, int, CodecsLoadByteOrder, int, int) 
      public void LoadTileStream2Example() 
      { 
         RasterCodecs.Startup(); 
         RasterCodecs codecs = new RasterCodecs(); 
 
         string srcFileName = @"C:\Program Files\LEAD Technologies\LEADTOOLS 15\Images\Eye.gif"; 
         string destFileName = @"C:\Program Files\LEAD Technologies\LEADTOOLS 15\Images\Image1_LoadTileStream2.bmp"; 
 
         FileStream fs = File.OpenRead(srcFileName); 
 
         // Get the image dimension 
         int pageNumber = 2; 
         CodecsImageInfo info = codecs.GetInformation(fs, true, pageNumber); 
 
         // Load the middle portion of the page 
         int width = info.Width / 3; 
         int height = info.Height / 3; 
         Rectangle rc = new Rectangle( 
            (info.Width - width) / 2, 
            (info.Height - height) / 2, 
            width, 
            height); 
 
         RasterImage image = codecs.Load(fs, rc, 1, CodecsLoadByteOrder.Rgb, 2, 2); 
         fs.Close(); 
 
         Debug.Assert(image.PageCount == 1); 
         Debug.Assert(image.Width == rc.Width); 
         Debug.Assert(image.Height == rc.Height); 
 
         // Save this image back to disk 
         codecs.Save(image, destFileName, RasterImageFormat.Bmp, 1); 
         image.Dispose(); 
 
         // Clean up 
         codecs.Dispose(); 
         RasterCodecs.Shutdown(); 
      }

Remarks

This method loads a section of an image file (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 options parameters before calling this method.

Support for 12 and 16-bit grayscale 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.

Requirements

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

See Also