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LEADTOOLS (Leadtools assembly)
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CreateThumbnail Method








Leadtools Namespace > RasterImage Class : CreateThumbnail Method
The desired maximum width of the thumbnail image in pixels.
The desired maximum height of the thumbnail image in pixels.
The desired bits per pixel.
The desired view perspective.
Flags that control the resize operation.
Creates a thumbnail image of this RasterImage.
Syntax
'Declaration
 

Public Function CreateThumbnail( _
   ByVal thumbnailWidth As Integer, _
   ByVal thumbnailHeight As Integer, _
   ByVal bitsPerPixel As Integer, _
   ByVal viewPerspective As RasterViewPerspective, _
   ByVal sizeFlags As RasterSizeFlags _
) As RasterImage
'Usage
 

Dim instance As RasterImage
Dim thumbnailWidth As Integer
Dim thumbnailHeight As Integer
Dim bitsPerPixel As Integer
Dim viewPerspective As RasterViewPerspective
Dim sizeFlags As RasterSizeFlags
Dim value As RasterImage
 
value = instance.CreateThumbnail(thumbnailWidth, thumbnailHeight, bitsPerPixel, viewPerspective, sizeFlags)
- (nullable LTRasterImage *)createThumbnailWithWidth:(NSInteger)width 
                                     thumbnailHeight:(NSInteger)height 
                                        bitsPerPixel:(NSInteger)bitsPerPixel 
                                viewPerspectiveToUse:(LTRasterViewPerspective)viewPerspective 
                                           sizeFlags:(LTRasterSizeFlags)sizeFlags 
                                               error:(NSError ** )error
            
public RasterImage createThumbnail(
  int thumbnailWidth, 
  int thumbnailHeight, 
  int bitsPerPixel, 
  RasterViewPerspective viewPerspective, 
  RasterSizeFlags sizeFlags
)
            
 function Leadtools.RasterImage.CreateThumbnail( 
   thumbnailWidth ,
   thumbnailHeight ,
   bitsPerPixel ,
   viewPerspective ,
   sizeFlags 
)

Parameters

thumbnailWidth
The desired maximum width of the thumbnail image in pixels.
thumbnailHeight
The desired maximum height of the thumbnail image in pixels.
bitsPerPixel
The desired bits per pixel.
viewPerspective
The desired view perspective.
sizeFlags
Flags that control the resize operation.

Return Value

A new RasterImage that is the thumbnail image.
Remarks

If the image width and height is less than thumbnailWidth and thumbnailHeight, then this method returns a copy of the image in the original size.

If the image width or height is greater than thumbnailWidth and thumbnailHeight, then this method will return the biggest thumbnail it can fit into the dimensions specified by thumbailWidth and thumbnailHeight, keeping the original image aspect ratio.

The result image will always have a resolution of 96 by 96 regardless of the resolution this RasterImage and will never return a thumbnail bigger than the original image.

Example
Copy Code   
Imports Leadtools
Imports Leadtools.Codecs
Imports Leadtools.ImageProcessing
Imports Leadtools.ImageProcessing.Core
Imports Leadtools.ImageProcessing.Color
Imports Leadtools.Controls
Imports Leadtools.Dicom
Imports Leadtools.Drawing
Imports Leadtools.Svg

      
Public Sub CreateThumbnailExample()
   Dim codecs As RasterCodecs = New RasterCodecs()
   Dim srcFileName As String = Path.Combine(LEAD_VARS.ImagesDir, "image1.cmp")

   ' Load the image
   Dim srcImage As RasterImage = codecs.Load(srcFileName)

   ' Use the CreateTumbnail method to create a thumbnail of this image
   Dim thumbnail As RasterImage = srcImage.CreateThumbnail(200, 200, 24, RasterViewPerspective.TopLeft, RasterSizeFlags.Bicubic)
   Debug.Assert(thumbnail.PageCount = 1)

   ' Clean up
   thumbnail.Dispose()
   srcImage.Dispose()
   codecs.Dispose()
End Sub

Public NotInheritable Class LEAD_VARS
Public Const ImagesDir As String = "C:\Users\Public\Documents\LEADTOOLS Images"
End Class
using Leadtools;
using Leadtools.Codecs;
using Leadtools.ImageProcessing;
using Leadtools.ImageProcessing.Core;
using Leadtools.ImageProcessing.Color;
using Leadtools.Dicom;
using Leadtools.Drawing;
using Leadtools.Controls;
using Leadtools.Svg;

      
public void CreateThumbnailExample()
{
   RasterCodecs codecs = new RasterCodecs();
   string srcFileName = Path.Combine(ImagesPath.Path, "image1.cmp");

   // Load the image
   RasterImage srcImage = codecs.Load(srcFileName);

   // Use the CreateTumbnail method to create a thumbnail of this image
   RasterImage thumbnail = srcImage.CreateThumbnail(200, 200, 24, RasterViewPerspective.TopLeft, RasterSizeFlags.Bicubic);
   Assert.IsTrue(thumbnail.PageCount == 1);

   // Clean up
   thumbnail.Dispose();
   srcImage.Dispose();
   codecs.Dispose();
}
RasterImageExamples.prototype.CreateThumbnailExample = function ()
{
   Tools.SetLicense();
   var codecs = new Leadtools.Codecs.RasterCodecs();

   var srcFileName = "Assets\\Image1.cmp";

   // Load the image
   return Tools.AppInstallFolder().getFileAsync(srcFileName).then(function ( loadFile ) {
      return codecs.loadAsync(Leadtools.LeadStreamFactory.create(loadFile));})
   .then ( function (srcImage ){

      // Use the CreateTumbnail method to create a thumbnail of this image
      var thumbnail = srcImage.createThumbnail(200, 200, 24, Leadtools.RasterViewPerspective.topLeft, Leadtools.RasterSizeFlags.bicubic);
      console.assert(thumbnail.pageCount == 1, "thumbnail.pageCount == 1");

      // Clean up
      thumbnail.close();
      srcImage.close();
      codecs.close();
   });
}
using Leadtools;
using Leadtools.Codecs;
using Leadtools.ImageProcessing;
using Leadtools.ImageProcessing.Core;
using Leadtools.ImageProcessing.Color;
using Leadtools.Dicom;

      
public async Task CreateThumbnailExample()
{
   RasterCodecs codecs = new RasterCodecs();
   string srcFileName = @"Assets\Image1.cmp";

   // Load the image
   StorageFile loadFile = await Tools.AppInstallFolder.GetFileAsync(srcFileName);
   RasterImage srcImage = await codecs.LoadAsync(LeadStreamFactory.Create(loadFile));

   // Use the CreateTumbnail method to create a thumbnail of this image
   RasterImage thumbnail = srcImage.CreateThumbnail(200, 200, 24, RasterViewPerspective.TopLeft, RasterSizeFlags.Bicubic);
   Assert.IsTrue(thumbnail.PageCount == 1);

   // Clean up
   thumbnail.Dispose();
   srcImage.Dispose();
   codecs.Dispose();
}
using Leadtools;
using Leadtools.Codecs;
using Leadtools.Dicom;
using Leadtools.ImageProcessing;
using Leadtools.ImageProcessing.Core;
using Leadtools.ImageProcessing.Color;
using Leadtools.Examples;
using Leadtools.Windows.Media;

public void CreateThumbnailExample(RasterImage srcImage)
{
   // Use the CreateTumbnail method to create a thumbnail of this image
   RasterImage thumbnail = srcImage.CreateThumbnail(200, 200, 24, RasterViewPerspective.TopLeft, RasterSizeFlags.Bicubic);
   Debug.Assert(thumbnail.PageCount == 1);
   // Clean up
   thumbnail.Dispose();
   srcImage.Dispose();
}
Imports Leadtools
Imports Leadtools.Codecs
Imports Leadtools.Dicom
Imports Leadtools.ImageProcessing
Imports Leadtools.ImageProcessing.Core
Imports Leadtools.ImageProcessing.Color
Imports Leadtools.Windows.Media

Public Sub CreateThumbnailExample(ByVal srcImage As RasterImage)
   ' Use the CreateTumbnail method to create a thumbnail of this image
   Dim thumbnail As RasterImage = srcImage.CreateThumbnail(200, 200, 24, RasterViewPerspective.TopLeft, RasterSizeFlags.Bicubic)
   Debug.Assert(thumbnail.PageCount = 1)
   ' Clean up
   thumbnail.Dispose()
   srcImage.Dispose()
End Sub
Requirements

Target Platforms

See Also

Reference

RasterImage Class
RasterImage Members

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