Loads an image file to the desired width, height, and bits per pixel, resizing the image as it loads.
public RasterImage Load(
Stream stream,
int width,
int height,
int bitsPerPixel,
RasterSizeFlags flags,
CodecsLoadByteOrder order
)
Public Overloads Function Load( _
ByVal stream As Stream, _
ByVal width As Integer, _
ByVal height As Integer, _
ByVal bitsPerPixel As Integer, _
ByVal flags As RasterSizeFlags, _
ByVal order As CodecsLoadByteOrder _
) As RasterImage
public RasterImage load(ILeadStream stream, int width, int height, int bitsPerPixel, RasterSizeFlags flags, CodecsLoadByteOrder order)
public:
RasterImage^ Load(
Stream^ stream,
int width,
int height,
int bitsPerPixel,
RasterSizeFlags flags,
CodecsLoadByteOrder order
)
stream
A Stream containing the image data 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 |
---|---|
RasterSizeFlagsRasterSizeFlags.None | Normal resizing |
RasterSizeFlagsRasterSizeFlags.Resample | Linear interpolation resizing |
RasterSizeFlagsRasterSizeFlags.Bicubic | Bicubic interpolation resizing |
RasterSizeFlagsRasterSizeFlags.FavorBlack | Not supported |
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. |
The RasterImage object that this method loads.
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 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.
The CodecsLoadOptions.AllPages property controls whether RasterCodecs will try to load all pages or just the first page if the image data contains multiple pages.
This example will load an image from file in a specified size.
using Leadtools;
using Leadtools.Codecs;
using Leadtools.ImageProcessing;
using Leadtools.ImageProcessing.Color;
using Leadtools.Svg;
using LeadtoolsExamples.Common;
public void LoadResize1Example()
{
RasterCodecs codecs = new RasterCodecs();
string srcFileName = Path.Combine(LEAD_VARS.ImagesDir, "Image1.cmp");
string destFileName = Path.Combine(LEAD_VARS.ImagesDir, "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();
}
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 LoadResize1Example()
Dim codecs As RasterCodecs = New RasterCodecs()
Dim srcFileName As String = Path.Combine(LEAD_VARS.ImagesDir, "Image1.cmp")
Dim destFileName As String = Path.Combine(LEAD_VARS.ImagesDir, "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()
End Sub
Public NotInheritable Class LEAD_VARS
Public Const ImagesDir As String = "C:\Users\Public\Documents\LEADTOOLS Images"
End Class
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