GetThumbnailImage(EventHandler<ProgressEventArgs>) Method (DngPage)

In This Topic

Returns a thumbnail image associated with this image page.

Syntax

Visual Basic
C#
Managed Extensions for C++
C++/CLI

'Declaration

Public Overloads Overrides Function GetThumbnailImage( _
   ByVal progressDelegateProgress delegate.
 As System.EventHandler(Of ProgressEventArgs) _
) As Vintasoft.Imaging.VintasoftImage

public override Vintasoft.Imaging.VintasoftImage GetThumbnailImage(
   System.EventHandler<ProgressEventArgs> progressDelegate
)

public: Vintasoft.Imaging.VintasoftImage* GetThumbnailImage(
   System.EventHandler<ProgressEventArgs*>* progressDelegate
); override

public:
Vintasoft.Imaging.VintasoftImage^ GetThumbnailImage(
   System.EventHandler<ProgressEventArgs^>^ progressDelegate
); override

Parameters

progressDelegate: Progress delegate.

Return Value

The thumbnail image associated with this ImagePage object if thumbnail image was loaded successfully; otherwise, null.

Example

Here is an example that shows how to open DNG-file, get thumbnail image from DNG-file and save image to a PNG-file:

VB.NET


''' <summary>
''' Opens DNG-file, gets thumbnail image from DNG-file and saves image to a PNG-file.
''' </summary>
''' <param name="dngFilename">The name of DNG-file.</param>
Public Sub GetAndSaveCrwThumbnail(dngFilename As String)
    ' open DNG-file stream
    Using fs As New System.IO.FileStream(dngFilename, System.IO.FileMode.Open, System.IO.FileAccess.Read)
        ' open DNG-file
        Dim rawImageFile As New Vintasoft.Imaging.Codecs.ImageFiles.Raw.RawImageFile(fs)
        ' get DNG-page
        Dim dngPage As Vintasoft.Imaging.Codecs.ImageFiles.Raw.DngPage = TryCast(rawImageFile.Page, Vintasoft.Imaging.Codecs.ImageFiles.Raw.DngPage)
        ' if DNG-page is found in RAW-file
        If dngPage IsNot Nothing Then
            ' get thumbnail image from DNG-file
            Using cr2Thumbnail As Vintasoft.Imaging.VintasoftImage = dngPage.GetThumbnailImage()
                ' save image to a PNG file
                cr2Thumbnail.Save(dngFilename & ".png")
            End Using
        End If
    End Using
End Sub


/// <summary>
/// Opens DNG-file, gets thumbnail image from DNG-file and saves image to a PNG-file.
/// </summary>
/// <param name="dngFilename">The name of DNG-file.</param>
public void GetAndSaveCrwThumbnail(string dngFilename)
{
    // open DNG-file stream
    using (System.IO.FileStream fs = new System.IO.FileStream(dngFilename, System.IO.FileMode.Open, System.IO.FileAccess.Read))
    {
        // open DNG-file
        Vintasoft.Imaging.Codecs.ImageFiles.Raw.RawImageFile rawImageFile =
            new Vintasoft.Imaging.Codecs.ImageFiles.Raw.RawImageFile(fs);
        // get DNG-page
        Vintasoft.Imaging.Codecs.ImageFiles.Raw.DngPage dngPage =
            rawImageFile.Page as Vintasoft.Imaging.Codecs.ImageFiles.Raw.DngPage;
        // if DNG-page is found in RAW-file
        if (dngPage != null)
        {
            // get thumbnail image from DNG-file
            using (Vintasoft.Imaging.VintasoftImage cr2Thumbnail = dngPage.GetThumbnailImage())
            {
                // save image to a PNG file
                cr2Thumbnail.Save(dngFilename + ".png");
            }
        }
    }
}

Requirements

Target Platforms: .NET9; .NET 8; .NET 7; .NET 6; .NET Framework 4.8, 4.7, 4.6, 4.5, 4.0, 3.5

Reference

DngPage Class
DngPage Members

Overload List

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