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

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

Syntax

Visual Basic (Declaration) 
Public Overloads 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 _
) 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 value As RasterImage
 
value = instance.Load(fileName, width, height, bitsPerPixel, flags, order)
C# 
public RasterImage Load( 
   string fileName,
   int width,
   int height,
   int bitsPerPixel,
   RasterSizeFlags flags,
   CodecsLoadByteOrder order
)
C++/CLI 
public:
RasterImage Load( 
   String^ fileName,
   int width,
   int height,
   int bitsPerPixel,
   RasterSizeFlags flags,
   CodecsLoadByteOrder order
) 

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.

Return Value

The RasterImage object that this method loads.

Example

This example will load an image from file in a specified size.

Visual BasicCopy Code
Public Sub LoadResize1Example()
   RasterCodecs.Startup()
   Dim codecs As RasterCodecs = New RasterCodecs()

   Dim srcFileName As String = LeadtoolsExamples.Common.ImagesPath.Path + "Image1.cmp"
   Dim destFileName As String = LeadtoolsExamples.Common.ImagesPath.Path + "LoadResize1.bmp"

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

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

   Dim image As RasterImage = codecs.Load(srcFileName, width, height, 0, RasterSizeFlags.Resample, CodecsLoadByteOrder.BgrOrGray)

   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
public void LoadResize1Example() 

   RasterCodecs.Startup(); 
   RasterCodecs codecs = new RasterCodecs(); 
 
   string srcFileName = LeadtoolsExamples.Common.ImagesPath.Path + "Image1.cmp"; 
   string destFileName = LeadtoolsExamples.Common.ImagesPath.Path + "LoadResize1.bmp"; 
 
   CodecsImageInfo info = codecs.GetInformation(srcFileName, true); 
 
   // We want to load the image as 320/200 
   int width = 320; 
   int height = 200; 
 
   RasterImage image = codecs.Load( 
      srcFileName, 
      width, 
      height, 
      0, 
      RasterSizeFlags.Resample, 
      CodecsLoadByteOrder.BgrOrGray); 
 
   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 to the desired width, height, and bits per pixel as it loads. 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 3.0, Windows XP, Windows Server 2003 family, Windows Server 2008 family

See Also