BitmapEncoder.Palette Eigenschaft

Definition

Dient zum Abrufen oder Festlegen eines Werts, der die BitmapPalette codierte Bitmap darstellt.

public:
 virtual property System::Windows::Media::Imaging::BitmapPalette ^ Palette { System::Windows::Media::Imaging::BitmapPalette ^ get(); void set(System::Windows::Media::Imaging::BitmapPalette ^ value); };
public virtual System.Windows.Media.Imaging.BitmapPalette Palette { get; set; }
member this.Palette : System.Windows.Media.Imaging.BitmapPalette with get, set
Public Overridable Property Palette As BitmapPalette

Eigenschaftswert

Eine Instanz von BitmapPalette.

Ausnahmen

Der BitmapPalette Wert, der an den Encoder übergeben wird, ist null.

Beispiele

Im folgenden Beispiel wird veranschaulicht, wie Sie eine benutzerdefinierte Palette auf ein Tagged Image File Format (TIFF)-Bild anwenden und anschließend codieren.

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

// Try creating a new image with a custom palette.
List<System.Windows.Media.Color> colors = new List<System.Windows.Media.Color>();
colors.Add(System.Windows.Media.Colors.Red);
colors.Add(System.Windows.Media.Colors.Blue);
colors.Add(System.Windows.Media.Colors.Green);
BitmapPalette myPalette = new BitmapPalette(colors);

// 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("empty.tif", FileMode.Create);
TiffBitmapEncoder encoder = new TiffBitmapEncoder();
TextBlock myTextBlock = new TextBlock();
myTextBlock.Text = "Codec Author is: " + encoder.CodecInfo.Author.ToString();
encoder.Frames.Add(BitmapFrame.Create(image));
MessageBox.Show(myPalette.Colors.Count.ToString());
encoder.Save(stream);
Dim width As Integer = 128
Dim height As Integer = width
Dim stride As Integer = CType(width / 8, Integer)
Dim pixels(height * stride) As Byte

' Try creating a new image with a custom palette.
Dim colors As New List(Of System.Windows.Media.Color)()
colors.Add(System.Windows.Media.Colors.Red)
colors.Add(System.Windows.Media.Colors.Blue)
colors.Add(System.Windows.Media.Colors.Green)
Dim myPalette As New BitmapPalette(colors)

' 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.Indexed1, myPalette, pixels, stride)
Dim stream As New FileStream("empty.tif", FileMode.Create)
Dim encoder As New TiffBitmapEncoder()
Dim myTextBlock As New TextBlock()
myTextBlock.Text = "Codec Author is: " + encoder.CodecInfo.Author.ToString()
encoder.Frames.Add(BitmapFrame.Create(image))
MessageBox.Show(myPalette.Colors.Count.ToString())
encoder.Save(stream)

Hinweise

Nur Tagged Image File Format (TIFF) und Graphics Interchange Format (GIF)-Bilder (und einige ältere, nicht standardmäßige Bitmap(BMP)-Bilder unterstützen Paletten.

Gilt für:

Weitere Informationen