Loads the specified image stream using specific options
public RasterImage Load(
Stream stream,
int bitsPerPixel,
CodecsLoadByteOrder order,
int firstPage,
int lastPage
)
Public Overloads Function Load( _
ByVal stream As Stream, _
ByVal bitsPerPixel As Integer, _
ByVal order As CodecsLoadByteOrder, _
ByVal firstPage As Integer, _
ByVal lastPage As Integer _
) As RasterImage
- (nullable LTRasterImage *)loadStream:(LTLeadStream *)stream
bitsPerPixel:(NSInteger)bitsPerPixel
order:(LTCodecsLoadByteOrder)order
firstPage:(NSInteger)firstPage
lastPage:(NSInteger)lastPage
error:(NSError **)error
public RasterImage load(ILeadStream stream, int bitsPerPixel, CodecsLoadByteOrder order, int firstPage, int lastPage)
public:
RasterImage^ Load(
Stream^ stream,
int bitsPerPixel,
CodecsLoadByteOrder order,
int firstPage,
int lastPage
)
stream
A Stream containing the image data 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 stream.
The RasterImage object that this method loads.
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 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 show how to load an image using different bits/pixel and color order than that saved on disk. Also, it will show how to load a single page or a group of pages from a multipage file All loading operation uses a stream instead of a file on disk
using Leadtools;
using Leadtools.Codecs;
using Leadtools.ImageProcessing;
using Leadtools.ImageProcessing.Color;
using Leadtools.Svg;
using LeadtoolsExamples.Common;
public void LoadStream2Example()
{
RasterCodecs codecs = new RasterCodecs();
string multiPageFileName = Path.Combine(LEAD_VARS.ImagesDir, "Eye.gif");
FileStream fs = File.OpenRead(multiPageFileName);
// Get the file information (we are interested in the number of pages)
CodecsImageInfo info = codecs.GetInformation(fs, true);
Console.WriteLine("Number of pages according to info: {0}", info.TotalPages);
// Load the first page
int first = 1;
int last = 1;
RasterImage image = codecs.Load(fs, 0, CodecsLoadByteOrder.BgrOrGray, first, last);
Console.WriteLine("Loading pages {0} to {1}, pages loaded = {2}", first, last, image.PageCount);
Debug.Assert(image.PageCount == last - first + 1);
image.Dispose();
// Load the second page
first = 2;
last = 2;
image = codecs.Load(fs, 0, CodecsLoadByteOrder.BgrOrGray, first, last);
Console.WriteLine("Loading pages {0} to {1}, pages loaded = {2}", first, last, image.PageCount);
Debug.Assert(image.PageCount == last - first + 1);
image.Dispose();
// Load from the second page to page before last
first = 2;
last = info.TotalPages - 1;
image = codecs.Load(fs, 0, CodecsLoadByteOrder.BgrOrGray, first, last);
Console.WriteLine("Loading pages {0} to {1}, pages loaded = {2}", first, last, image.PageCount);
Debug.Assert(image.PageCount == last - first + 1);
image.Dispose();
// load all the pages
image = codecs.Load(fs, 0, CodecsLoadByteOrder.BgrOrGray, 1, -1);
Console.WriteLine("Loading all pages, pages loaded = {0}", image.PageCount);
Debug.Assert(image.PageCount == info.TotalPages);
image.Dispose();
fs.Close();
// 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 LoadStream2Example()
Dim codecs As RasterCodecs = New RasterCodecs()
Dim multiPageFileName As String = Path.Combine(LEAD_VARS.ImagesDir, "Eye.gif")
Dim fs As FileStream = File.OpenRead(multiPageFileName)
' Get the file information (we are interested in the number of pages)
Dim info As CodecsImageInfo = codecs.GetInformation(fs, True)
Console.WriteLine("Number of pages according to info: {0}", info.TotalPages)
' Load the first page
Dim first As Integer = 1
Dim last As Integer = 1
Dim image As RasterImage = codecs.Load(fs, 0, CodecsLoadByteOrder.BgrOrGray, first, last)
Console.WriteLine("Loading pages {0} to {1}, pages loaded = {2}", first, last, image.PageCount)
Debug.Assert(image.PageCount = last - first + 1)
image.Dispose()
' Load the second page
first = 2
last = 2
image = codecs.Load(fs, 0, CodecsLoadByteOrder.BgrOrGray, first, last)
Console.WriteLine("Loading pages {0} to {1}, pages loaded = {2}", first, last, image.PageCount)
Debug.Assert(image.PageCount = last - first + 1)
image.Dispose()
' Load from the second page to page before last
first = 2
last = info.TotalPages - 1
image = codecs.Load(fs, 0, CodecsLoadByteOrder.BgrOrGray, first, last)
Console.WriteLine("Loading pages {0} to {1}, pages loaded = {2}", first, last, image.PageCount)
Debug.Assert(image.PageCount = last - first + 1)
image.Dispose()
' load all the pages
image = codecs.Load(fs, 0, CodecsLoadByteOrder.BgrOrGray, 1, -1)
Console.WriteLine("Loading all pages, pages loaded = {0}", image.PageCount)
Debug.Assert(image.PageCount = info.TotalPages)
image.Dispose()
fs.Close()
' Clean up
codecs.Dispose()
End Sub
Public NotInheritable Class LEAD_VARS
Public Const ImagesDir As String = "C:\Users\Public\Documents\LEADTOOLS Images"
End Class
c#[Silverlight C# Example]
using Leadtools;
using Leadtools.Codecs;
using Leadtools.Examples;
using Leadtools.ImageProcessing;
using Leadtools.ImageProcessing.Color;
using Leadtools.Windows.Media;
public void LoadStream2Example(Stream inStreamMultiGif)
{
RasterCodecs codecs = new RasterCodecs();
// Get the file information (we are interested in the number of pages)
CodecsImageInfo info = codecs.GetInformation(inStreamMultiGif, true);
Debug.WriteLine("Number of pages according to info: {0}", info.TotalPages);
// Load the first page
int first = 1;
int last = 1;
RasterImage image = codecs.Load(inStreamMultiGif, 0, CodecsLoadByteOrder.BgrOrGray, first, last);
Debug.WriteLine("Loading pages {0} to {1}, pages loaded = {2}", first, last, image.PageCount);
Debug.Assert(image.PageCount == last - first + 1);
image.Dispose();
// Load the second page
first = 2;
last = 2;
image = codecs.Load(inStreamMultiGif, 0, CodecsLoadByteOrder.BgrOrGray, first, last);
Debug.WriteLine("Loading pages {0} to {1}, pages loaded = {2}", first, last, image.PageCount);
Debug.Assert(image.PageCount == last - first + 1);
image.Dispose();
// Load from the second page to page before last
first = 2;
last = info.TotalPages - 1;
image = codecs.Load(inStreamMultiGif, 0, CodecsLoadByteOrder.BgrOrGray, first, last);
Debug.WriteLine("Loading pages {0} to {1}, pages loaded = {2}", first, last, image.PageCount);
Debug.Assert(image.PageCount == last - first + 1);
image.Dispose();
// load all the pages
image = codecs.Load(inStreamMultiGif, 0, CodecsLoadByteOrder.BgrOrGray, 1, -1);
Debug.WriteLine("Loading all pages, pages loaded = {0}", image.PageCount);
Debug.Assert(image.PageCount == info.TotalPages);
image.Dispose();
inStreamMultiGif.Close();
}
vb[Silverlight VB Example]
Imports Leadtools
Imports Leadtools.Codecs
Imports Leadtools.ImageProcessing
Imports Leadtools.ImageProcessing.Color
Imports Leadtools.Windows.Media
Public Sub LoadStream2Example(ByVal inStreamMultiGif As Stream)
Dim codecs As RasterCodecs = New RasterCodecs()
' Get the file information (we are interested in the number of pages)
Dim info As CodecsImageInfo = codecs.GetInformation(inStreamMultiGif, True)
Debug.WriteLine("Number of pages according to info: {0}", info.TotalPages)
' Load the first page
Dim first As Integer = 1
Dim last As Integer = 1
Dim image As RasterImage = codecs.Load(inStreamMultiGif, 0, CodecsLoadByteOrder.BgrOrGray, first, last)
Debug.WriteLine("Loading pages {0} to {1}, pages loaded = {2}", first, last, image.PageCount)
Debug.Assert(image.PageCount = last - first + 1)
image.Dispose()
' Load the second page
first = 2
last = 2
image = codecs.Load(inStreamMultiGif, 0, CodecsLoadByteOrder.BgrOrGray, first, last)
Debug.WriteLine("Loading pages {0} to {1}, pages loaded = {2}", first, last, image.PageCount)
Debug.Assert(image.PageCount = last - first + 1)
image.Dispose()
' Load from the second page to page before last
first = 2
last = info.TotalPages - 1
image = codecs.Load(inStreamMultiGif, 0, CodecsLoadByteOrder.BgrOrGray, first, last)
Debug.WriteLine("Loading pages {0} to {1}, pages loaded = {2}", first, last, image.PageCount)
Debug.Assert(image.PageCount = last - first + 1)
image.Dispose()
' load all the pages
image = codecs.Load(inStreamMultiGif, 0, CodecsLoadByteOrder.BgrOrGray, 1, -1)
Debug.WriteLine("Loading all pages, pages loaded = {0}", image.PageCount)
Debug.Assert(image.PageCount = info.TotalPages)
image.Dispose()
inStreamMultiGif.Close()
End Sub
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