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GifBitmapEncoder Class

Defines an encoder that is used to encode Graphics Interchange Format (GIF) images.

Namespace:  System.Windows.Media.Imaging
Assembly:  PresentationCore (in PresentationCore.dll)
XMLNS for XAML: http://schemas.microsoft.com/winfx/2006/xaml/presentation, http://schemas.microsoft.com/netfx/2007/xaml/presentation

public sealed class GifBitmapEncoder : BitmapEncoder

The GifBitmapEncoder type exposes the following members.

  NameDescription
Public methodGifBitmapEncoderInitializes a new instance of the GifBitmapEncoder class.
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  NameDescription
Public propertyCodecInfoGets information that describes this codec. (Inherited from BitmapEncoder.)
Public propertyColorContextsGets or sets a value that represents the color profile that is associated with this encoder. (Inherited from BitmapEncoder.)
Public propertyDispatcherGets the Dispatcher this DispatcherObject is associated with. (Inherited from DispatcherObject.)
Public propertyFramesGets or sets the individual frames within an image. (Inherited from BitmapEncoder.)
Public propertyMetadataGets or sets the metadata that will be associated with this bitmap during encoding. (Inherited from BitmapEncoder.)
Public propertyPaletteGets or sets a value that represents the BitmapPalette of an encoded bitmap. (Inherited from BitmapEncoder.)
Public propertyPreviewGets or sets a BitmapSource that represents the global preview of a bitmap, if there is one. (Inherited from BitmapEncoder.)
Public propertyThumbnailGets or sets a BitmapSource that represents the global embedded thumbnail. (Inherited from BitmapEncoder.)
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  NameDescription
Public methodCheckAccessDetermines whether the calling thread has access to this DispatcherObject. (Inherited from DispatcherObject.)
Public methodEquals(Object)Determines whether the specified object is equal to the current object. (Inherited from Object.)
Public methodGetHashCodeServes as the default hash function. (Inherited from Object.)
Public methodGetTypeGets the Type of the current instance. (Inherited from Object.)
Public methodSaveEncodes a bitmap image to a specified Stream. (Inherited from BitmapEncoder.)
Public methodToStringReturns a string that represents the current object. (Inherited from Object.)
Public methodVerifyAccessEnforces that the calling thread has access to this DispatcherObject. (Inherited from DispatcherObject.)
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Graphics Interchange Format (GIF) images do not support global preview, global thumbnails, global metadata, frame level thumbnails, or frame level metadata. Graphics Interchange Format (GIF) images do support multiple frames.

Encoding does not work in partial trust. See WPF Partial Trust Security for information on partial trust.

The following examples show how to decode and encode a Graphics Interchange Format (GIF) image using the specific GifBitmapDecoder and GifBitmapEncoder objects.

This example demonstrates how to decode a GIF image using a GifBitmapDecoder from a FileStream.


// Open a Stream and decode a GIF image
Stream imageStreamSource = new FileStream("tulipfarm.gif", FileMode.Open, FileAccess.Read, FileShare.Read);
GifBitmapDecoder decoder = new GifBitmapDecoder(imageStreamSource, BitmapCreateOptions.PreservePixelFormat, BitmapCacheOption.Default);
BitmapSource bitmapSource = decoder.Frames[0];

// Draw the Image
Image myImage = new Image();
myImage.Source = bitmapSource;
myImage.Stretch = Stretch.None;
myImage.Margin = new Thickness(20);

This example demonstrates how to encode a BitmapSource into a GIF image using a GifBitmapEncoder.

            int width = 128;
            int height = width;
            int stride = width / 8;
            byte[] pixels = new byte[height * stride];

            // Define the image palette
            BitmapPalette myPalette = BitmapPalettes.WebPalette;

            // Creates a new empty image with the pre-defined palette

            BitmapSource image = BitmapSource.Create(
                width,
                height,
                96,
                96,
                PixelFormats.Indexed1,
                myPalette,
                pixels,
                stride);

            FileStream stream = new FileStream("new.gif", FileMode.Create);
            GifBitmapEncoder encoder = new GifBitmapEncoder();
            TextBlock myTextBlock = new TextBlock();
            myTextBlock.Text = "Codec Author is: " + encoder.CodecInfo.Author.ToString();
            encoder.Frames.Add(BitmapFrame.Create(image));
            encoder.Save(stream);

.NET Framework

Supported in: 4.5, 4, 3.5, 3.0

.NET Framework Client Profile

Supported in: 4, 3.5 SP1

Windows 8.1, Windows Server 2012 R2, Windows 8, Windows Server 2012, Windows 7, Windows Vista SP2, Windows Server 2008 (Server Core Role not supported), Windows Server 2008 R2 (Server Core Role supported with SP1 or later; Itanium not supported)

The .NET Framework does not support all versions of every platform. For a list of the supported versions, see .NET Framework System Requirements.

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