PngBitmapEncoder Class

Defines an encoder that is used to encode Portable Network Graphics (PNG) format images. This class cannot be inherited.

Namespace: System.Windows.Media.Imaging
Assembly: PresentationCore (in presentationcore.dll)
XML Namespace:  http://schemas.microsoft.com/winfx/2006/xaml/presentation

'Declaration
Public NotInheritable Class PngBitmapEncoder
	Inherits BitmapEncoder
'Usage
Dim instance As PngBitmapEncoder

public final class PngBitmapEncoder extends BitmapEncoder
public final class PngBitmapEncoder extends BitmapEncoder
<PngBitmapEncoder .../>

Portable Network Graphics (PNG) format bitmaps support frame level metadata. They do not support preview, global thumbnails, frame level thumbnails, global metadata, or multiple frames.

Encoding does not work in partial trust. See the Windows Presentation Foundation Partial Trust Programming topic for information on partial trust.

The following example demonstrates how to use the PngBitmapEncoder to encode a new bitmap image.

Dim width As Integer = 128
Dim height As Integer = 128
Dim stride As Integer = width
Dim pixels(width * stride) As Byte

' Define the image palette
Dim myPalette As BitmapPalette = BitmapPalettes.Halftone256

' Creates a new empty image with the pre-defined palette
Dim image As BitmapSource = System.Windows.Media.Imaging.BitmapSource.Create( _
    width, height, 96, 96, PixelFormats.Indexed8, myPalette, pixels, stride)
Dim stream As New FileStream("new.png", FileMode.Create)
Dim encoder As New PngBitmapEncoder()
Dim myTextBlock As New TextBlock()
myTextBlock.Text = "Codec Author is: " + encoder.CodecInfo.Author.ToString()
encoder.Interlace = PngInterlaceOption.On
encoder.Frames.Add(BitmapFrame.Create(image))
encoder.Save(stream)

Any public static (Shared in Visual Basic) members of this type are thread safe. Any instance members are not guaranteed to be thread safe.

Windows 98, Windows Server 2000 SP4, Windows CE, Windows Millennium Edition, Windows Mobile for Pocket PC, Windows Mobile for Smartphone, Windows Server 2003, Windows XP Media Center Edition, Windows XP Professional x64 Edition, Windows XP SP2, Windows XP Starter Edition

The Microsoft .NET Framework 3.0 is supported on Windows Vista, Microsoft Windows XP SP2, and Windows Server 2003 SP1.

.NET Framework

Supported in: 3.0

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