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CreateThumbnail Method

Summary

Creates a thumbnail image of this RasterImage.

Syntax
C#
VB
Java
Objective-C
C++
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 
- (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 
) 

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
C#
VB
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 LeadtoolsExamples.Common; 
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(); 
} 
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 
c#[Silverlight C# Example] 
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(); 
} 
vb[Silverlight VB Example] 
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

Help Version 20.0.2019.9.19
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