Loads the specified rectangle from the specified image file using the specified options.
public RasterImage Load(
string fileName,
LeadRect tile,
int bitsPerPixel,
CodecsLoadByteOrder order,
int firstPage,
int lastPage
)
Public Overloads Function Load( _
ByVal fileName As String, _
ByVal tile As LeadRect, _
ByVal bitsPerPixel As Integer, _
ByVal order As CodecsLoadByteOrder, _
ByVal firstPage As Integer, _
ByVal lastPage As Integer _
) As RasterImage
- (nullable LTRasterImage *)loadFile:(NSString *)file
tile:(LeadRect)tile
bitsPerPixel:(NSInteger)bitsPerPixel
order:(LTCodecsLoadByteOrder)order
firstPage:(NSInteger)firstPage
lastPage:(NSInteger)lastPage
error:(NSError **)error
public:
RasterImage^ Load(
String^ fileName,
LeadRect tile,
int bitsPerPixel,
CodecsLoadByteOrder order,
int firstPage,
int lastPage
)
fileName
A String containing the name of the image file to load.
tile
A LeadRect describing the tile/area of the image to load.
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. |
order
Color order for 16-bit, 24-bit, 32-bit, 48-bit, 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.
The RasterImage object that this method loads.
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 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 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.
This example will load the middle portion of the second page of a multipage file as 1 bits/pixel
using Leadtools;
using Leadtools.Codecs;
using Leadtools.ImageProcessing;
using Leadtools.ImageProcessing.Color;
using Leadtools.Svg;
using LeadtoolsExamples.Common;
public void LoadTileFile2Example()
{
RasterCodecs codecs = new RasterCodecs();
string srcFileName = Path.Combine(LEAD_VARS.ImagesDir, "Eye.gif");
string destFileName = Path.Combine(LEAD_VARS.ImagesDir, "Image1_LoadTileFile2.bmp");
// Get the image dimension
int pageNumber = 2;
CodecsImageInfo info = codecs.GetInformation(srcFileName, true, pageNumber);
// Load the middle portion of the page
int width = info.Width / 3;
int height = info.Height / 3;
LeadRect rc = new LeadRect(
(info.Width - width) / 2,
(info.Height - height) / 2,
width,
height);
RasterImage image = codecs.Load(srcFileName, rc, 1, CodecsLoadByteOrder.Rgb, 2, 2);
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();
}
static class LEAD_VARS
{
public const string ImagesDir = @"C:\Users\Public\Documents\LEADTOOLS Images";
}
Imports Leadtools
Imports Leadtools.Codecs
Imports Leadtools.ImageProcessing
Imports Leadtools.ImageProcessing.Color
Imports Leadtools.Drawing
Imports Leadtools.Svg
Public Sub LoadTileFile2Example()
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, "Image1_LoadTileFile2.bmp")
' Get the image dimension
Dim pageNumber As Integer = 2
Dim info As CodecsImageInfo = codecs.GetInformation(srcFileName, 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 LeadRect = New LeadRect((info.Width - width) \ 2, (info.Height - height) \ 2, width, height)
Dim image As RasterImage = codecs.Load(srcFileName, rc, 1, CodecsLoadByteOrder.Rgb, 2, 2)
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()
End Sub
Public NotInheritable Class LEAD_VARS
Public Const ImagesDir As String = "C:\Users\Public\Documents\LEADTOOLS Images"
End Class
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