public class RasterImageResize
Public Class RasterImageResize
public ref class RasterImageResize
This class supports changing the color order, bits per pixel and/or palette, during the resize operation.
This sample loads an image and uses the RasterImageResize class to resize it to half its size.
using Leadtools;
using Leadtools.Codecs;
public void RasterImageResizeExample()
{
string srcFileName = Path.Combine(LEAD_VARS.ImagesDir, "Image1.cmp");
string destFileName = Path.Combine(LEAD_VARS.ImagesDir, "Image1_RasterImageResize.bmp");
using (RasterCodecs codecs = new RasterCodecs())
{
// Load the source image
using (RasterImage srcImage = codecs.Load(srcFileName))
{
// We will resize to half the original size
int destWidth = srcImage.Width / 2;
int destHeight = srcImage.Height / 2;
// Create the destination image
using (RasterImage destImage = new RasterImage(
RasterMemoryFlags.Conventional,
destWidth,
destHeight,
srcImage.BitsPerPixel,
srcImage.Order,
srcImage.ViewPerspective,
srcImage.GetPalette(),
IntPtr.Zero,
0))
{
RasterImageResize resize = new RasterImageResize();
// Add Event Handler
resize.Resize += new EventHandler<RasterImageResizeEventArgs>(resize_Resize);
byte[] buffer = new byte[destImage.BytesPerLine];
// Start the resize process
resize.Start(
srcImage,
destWidth,
destHeight,
srcImage.BitsPerPixel,
srcImage.Order,
srcImage.DitheringMethod,
RasterSizeFlags.None,
srcImage.GetPalette());
destImage.Access();
// get the rows for the resized image, one by one
for (int row = 0; row < destImage.Height; row++)
{
resize.ResizeBuffer(row, 0, buffer, 0, destImage.BytesPerLine);
destImage.SetRow(row, buffer, 0, destImage.BytesPerLine);
}
destImage.Release();
resize.Stop();
// Save the destination image
codecs.Save(destImage, destFileName, RasterImageFormat.Bmp, 24);
}
}
}
}
private void resize_Resize(object sender, RasterImageResizeEventArgs e)
{
// e.Row should ALWAYS be less than e.Image.Height
if (e.Row >= e.Image.Height)
{
e.Cancel = true; // abort the resize
return;
}
byte[] buffer = new byte[e.Bytes];
e.Image.Access();
e.Image.GetRowColumn(e.Row, e.Column, buffer, 0, e.Bytes);
e.Image.Release();
Marshal.Copy(buffer, 0, e.Buffer, e.Bytes);
Console.WriteLine("{0}, {1}", e.Row, e.Column);
}
static class LEAD_VARS
{
public const string ImagesDir = @"C:\LEADTOOLS21\Resources\Images";
}
Imports Leadtools
Imports Leadtools.Codecs
Public Sub RasterImageResizeExample()
Dim codecs As RasterCodecs = New RasterCodecs()
codecs.ThrowExceptionsOnInvalidImages = True
Dim srcFileName As String = Path.Combine(LEAD_VARS.ImagesDir, "Image1.cmp")
Dim destFileName As String = Path.Combine(LEAD_VARS.ImagesDir, "Image1_RasterImageResize.bmp")
' Load the source image
Dim srcImage As RasterImage = codecs.Load(srcFileName)
Dim resize As RasterImageResize = New RasterImageResize()
' Add Handler
AddHandler resize.Resize, AddressOf resize_Resize
' We will resize to half the original size
Dim destWidth As Integer = srcImage.Width \ 2
Dim destHeight As Integer = srcImage.Height \ 2
' Start the resize process
resize.Start(srcImage, destWidth, destHeight, srcImage.BitsPerPixel, srcImage.Order,
srcImage.DitheringMethod, RasterSizeFlags.None, srcImage.GetPalette())
' Create the destination image
Dim destImage As RasterImage = New RasterImage(
RasterMemoryFlags.Conventional, destWidth, destHeight,
srcImage.BitsPerPixel, srcImage.Order, srcImage.ViewPerspective, srcImage.GetPalette(), IntPtr.Zero, 0)
Dim buffer As Byte() = New Byte(destImage.BytesPerLine - 1) {}
' get the rows for the resized image, one by one
Dim row As Integer = 0
srcImage.Access()
destImage.Access()
Do While row < destImage.Height
resize.ResizeBuffer(row, 0, buffer, 0, destImage.BytesPerLine)
destImage.SetRow(row, buffer, 0, destImage.BytesPerLine)
row += 1
Loop
srcImage.Release()
destImage.Release()
resize.Stop()
' save the destination image
codecs.Save(destImage, destFileName, RasterImageFormat.Bmp, 24)
' clean up
srcImage.Dispose()
destImage.Dispose()
End Sub
Private Sub resize_Resize(ByVal sender As Object, ByVal e As RasterImageResizeEventArgs)
' e.Row should ALWAYS be less than e.Image.Height
If e.Row >= e.Image.Height Then
e.Cancel = True ' abort the resize
Return
End If
Dim buffer As Byte() = New Byte(e.Bytes - 1) {}
e.Image.Access()
e.Image.GetRowColumn(e.Row, e.Column, buffer, 0, e.Bytes)
e.Image.Release()
Marshal.Copy(buffer, 0, e.Buffer, e.Bytes)
Console.WriteLine("{0}, {1}", e.Row, e.Column)
End Sub
Public NotInheritable Class LEAD_VARS
Public Const ImagesDir As String = "C:\LEADTOOLS21\Resources\Images"
End Class
Help Collections
Raster .NET | C API | C++ Class Library | HTML5 JavaScript
Document .NET | C API | C++ Class Library | HTML5 JavaScript
Medical .NET | C API | C++ Class Library | HTML5 JavaScript
Medical Web Viewer .NET
Multimedia
Direct Show .NET | C API | Filters
Media Foundation .NET | C API | Transforms
Supported Platforms
.NET, Java, Android, and iOS/macOS Assemblies
Imaging, Medical, and Document
C API/C++ Class Libraries
Imaging, Medical, and Document
HTML5 JavaScript Libraries
Imaging, Medical, and Document
Your email has been sent to support! Someone should be in touch! If your matter is urgent please come back into chat.
Chat Hours:
Monday - Friday, 8:30am to 6pm ET
Thank you for your feedback!
Please fill out the form again to start a new chat.
All agents are currently offline.
Chat Hours:
Monday - Friday
8:30AM - 6PM EST
To contact us please fill out this form and we will contact you via email.