PngBitmapEncoder Class
.NET Framework 3.0
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
Assembly: PresentationCore (in presentationcore.dll)
XML Namespace: http://schemas.microsoft.com/winfx/2006/xaml/presentation
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)
System.Object
System.Windows.Threading.DispatcherObject
System.Windows.Media.Imaging.BitmapEncoder
System.Windows.Media.Imaging.PngBitmapEncoder
System.Windows.Threading.DispatcherObject
System.Windows.Media.Imaging.BitmapEncoder
System.Windows.Media.Imaging.PngBitmapEncoder
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.Community Additions
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