Load(String,Int32,Int32,Int32,RasterSizeFlags,CodecsLoadByteOrder,Int32,Int32) Method

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

Syntax

Visual Basic
C#
WinRT C#
WinRT JavaScript
C++

public RasterImage Load( 
   string fileName,
   int width,
   int height,
   int bitsPerPixel,
   RasterSizeFlags flags,
   CodecsLoadByteOrder order,
   int firstPage,
   int lastPage
)

'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, _
   ByVal firstPage As Integer, _
   ByVal lastPage As Integer _
) As RasterImage

'Usage
 
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)

public RasterImage Load( 
   string fileName,
   int width,
   int height,
   int bitsPerPixel,
   RasterSizeFlags flags,
   CodecsLoadByteOrder order,
   int firstPage,
   int lastPage
)

 function Leadtools.Codecs.RasterCodecs.Load(String,Int32,Int32,Int32,RasterSizeFlags,CodecsLoadByteOrder,Int32,Int32)( 
   fileName ,
   width ,
   height ,
   bitsPerPixel ,
   flags ,
   order ,
   firstPage ,
   lastPage 
)

public:
RasterImage^ Load( 
   String^ fileName,
   int width,
   int height,
   int bitsPerPixel,
   RasterSizeFlags flags,
   CodecsLoadByteOrder order,
   int firstPage,
   int lastPage
)

Parameters

fileName

A System.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:

Value	Meaning
0	Keep the original file's pixel depth (Do not convert).
1 to 8	The specified bits per pixel in the resulting image.
12	12 bits per pixel in the resulting image.
16	16 bits per pixel in the resulting image.
24	24 bits per pixel in the resulting image.
32	32 bits per pixel in the resulting image.
48	48 bits per pixel in the resulting image.
64	64 bits per pixel in the resulting image.

flags

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

Value	Meaning
Leadtools.RasterSizeFlagsRasterSizeFlags.None	Normal resizing
Leadtools.RasterSizeFlagsRasterSizeFlags.Resample	Linear interpolation resizing
Leadtools.RasterSizeFlagsRasterSizeFlags.Bicubic	Bicubic interpolation resizing
Leadtools.RasterSizeFlagsRasterSizeFlags.FavorBlack	Not 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.

Value	Meaning
CodecsLoadByteOrder.Rgb	Red, green, and blue color order in memory
CodecsLoadByteOrder.Bgr	Blue, green, and red color order in memory
CodecsLoadByteOrder.Gray	12 or 16-bit grayscale image. 12 and 16-bit grayscale images are only supported in the Document/Medical Imaging editions.
CodecsLoadByteOrder.RgbOrGray	Load 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.BgrOrGray	Load 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.Romm	ROMM order. ROMM only supports 24 and 48-bit images
CodecsLoadByteOrder.BgrOrGrayOrRomm	Load 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 Leadtools.RasterImage object that this method loads.

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 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.

Example

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

Public Sub LoadResize2Example()
      Dim codecs As RasterCodecs = New RasterCodecs()

      Dim srcFileName As String = Path.Combine(LEAD_VARS.ImagesDir, "Eye.gif")
      Dim destFileName As String = Path.Combine(LEAD_VARS.ImagesDir, "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()
   End Sub

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

public void LoadResize2Example()
     {
         RasterCodecs codecs = new RasterCodecs();

         string srcFileName = Path.Combine(LEAD_VARS.ImagesDir, "Eye.gif");
         string destFileName = Path.Combine(LEAD_VARS.ImagesDir, "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();
     }

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

Requirements

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

Reference

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