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Load(String,Int32,Int32,Int32,RasterSizeFlags,CodecsLoadByteOrder,Int32,Int32) Method
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Leadtools.Codecs Namespace > RasterCodecs Class > Load Method : Load(String,Int32,Int32,Int32,RasterSizeFlags,CodecsLoadByteOrder,Int32,Int32) Method




fileName
A String containing the name of the image file to load.
width
New width of the image in pixels.
height
New height of the image in pixels.
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.

flags

Flag that indicates the type of resizing to use. Possible values are:

ValueMeaning
RasterSizeFlagsRasterSizeFlags.NoneNormal resizing
RasterSizeFlagsRasterSizeFlags.ResampleLinear interpolation resizing
RasterSizeFlagsRasterSizeFlags.BicubicBicubic interpolation resizing
RasterSizeFlagsRasterSizeFlags.FavorBlackNot supported

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 an image file to the desired width, height, and bits per pixel, resizing as it loads.

Syntax

Visual Basic (Declaration) 
Overloads Public Function Load( _
   ByVal fileName As String, _
   ByVal width As Integer, _
   ByVal height As Integer, _
   ByVal bitsPerPixel As Integer, _
   ByVal flags As RasterSizeFlags, _
   ByVal order As CodecsLoadByteOrder, _
   ByVal firstPage As Integer, _
   ByVal lastPage As Integer _
) As RasterImage
Visual Basic (Usage)Copy Code
Dim instance As RasterCodecs
Dim fileName As String
Dim width As Integer
Dim height As Integer
Dim bitsPerPixel As Integer
Dim flags As RasterSizeFlags
Dim order As CodecsLoadByteOrder
Dim firstPage As Integer
Dim lastPage As Integer
Dim value As RasterImage
 
value = instance.Load(fileName, width, height, bitsPerPixel, flags, order, firstPage, lastPage)
C# 
public RasterImage Load( 
   string fileName,
   int width,
   int height,
   int bitsPerPixel,
   RasterSizeFlags flags,
   CodecsLoadByteOrder order,
   int firstPage,
   int lastPage
)
Managed Extensions for C++ 
public: RasterImage Load( 
   string* fileName,
   int width,
   int height,
   int bitsPerPixel,
   RasterSizeFlags flags,
   CodecsLoadByteOrder order,
   int firstPage,
   int lastPage
)
C++/CLI 
public:
RasterImage Load( 
   String^ fileName,
   int width,
   int height,
   int bitsPerPixel,
   RasterSizeFlags flags,
   CodecsLoadByteOrder order,
   int firstPage,
   int lastPage
)

Parameters

fileName
A String containing the name of the image file to load.
width
New width of the image in pixels.
height
New height of the image in pixels.
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.

flags

Flag that indicates the type of resizing to use. Possible values are:

ValueMeaning
RasterSizeFlagsRasterSizeFlags.NoneNormal resizing
RasterSizeFlagsRasterSizeFlags.ResampleLinear interpolation resizing
RasterSizeFlagsRasterSizeFlags.BicubicBicubic interpolation resizing
RasterSizeFlagsRasterSizeFlags.FavorBlackNot supported

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(string, int, int, int, RasterSizeFlags, CodecsLoadByteOrder, int, int)
      Public Sub LoadResize2Example()
         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\LoadResize2.bmp"

         Dim info As CodecsImageInfo = codecs.GetInformation(srcFileName, True)

         ' Get the page number to load
         Dim pageNumber As Integer = info.TotalPages

         ' We want to load the image as 320/200
         Dim width As Integer = 320
         Dim height As Integer = 200

         ' Load the last page in the specified size
         Dim image As RasterImage = codecs.Load(srcFileName, width, height, 0, RasterSizeFlags.Resample, CodecsLoadByteOrder.BgrOrGray, pageNumber, pageNumber)

         Debug.Assert(image.Width = width)
         Debug.Assert(image.Height = height)

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

         ' Clean up
         codecs.Dispose()
         RasterCodecs.Shutdown()
      End Sub
C#Copy Code
RasterCodecs.Load(string, int, int, int, RasterSizeFlags, CodecsLoadByteOrder, int, int) 
      public void LoadResize2Example() 
      { 
         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\LoadResize2.bmp"; 
 
         CodecsImageInfo info = codecs.GetInformation(srcFileName, true); 
 
         // Get the page number to load 
         int pageNumber = info.TotalPages; 
 
         // We want to load the image as 320/200 
         int width = 320; 
         int height = 200; 
 
         // Load the last page in the specified size 
         RasterImage image = codecs.Load( 
            srcFileName, 
            width, 
            height, 
            0, 
            RasterSizeFlags.Resample, 
            CodecsLoadByteOrder.BgrOrGray, 
            pageNumber, 
            pageNumber); 
 
         Debug.Assert(image.Width == width); 
         Debug.Assert(image.Height == height); 
 
         // Save this image back to disk 
         codecs.Save(image, destFileName, RasterImageFormat.Bmp, 24); 
         image.Dispose(); 
 
         // Clean up 
         codecs.Dispose(); 
         RasterCodecs.Shutdown(); 
      }

Remarks

This method resizes a file as it loads, to the desired width, height, and bits per pixel. Note that the original file is not completely loaded into memory. This method is ideal for sampling large images (i.e. generating a thumbnail) without the memory overhead of loading the large file itself.

The file can be in any supported image file format and bits per pixel, whether compressed or uncompressed.

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