BitmapPalette Class
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Defines the available color palette for a supported image type.
public ref class BitmapPalette sealed : System::Windows::Threading::DispatcherObject
public sealed class BitmapPalette : System.Windows.Threading.DispatcherObject
type BitmapPalette = class
inherit DispatcherObject
Public NotInheritable Class BitmapPalette
Inherits DispatcherObject
- Inheritance
The following example demonstrates how to define a custom BitmapPalette and apply it to a new BitmapSource.
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)
The following example demonstrates how to retrieve a BitmapPalette from an image.
// Get the palette from an image
BitmapImage image2 = new BitmapImage();
image2.BeginInit();
image2.UriSource = new Uri("tulipfarm.tif", UriKind.RelativeOrAbsolute);
image2.EndInit();
BitmapPalette myPalette3 = new BitmapPalette(image2, 256);
//Draw the third Image
Image myImage2 = new Image();
myImage2.Source = image2;
myImage2.Stretch = Stretch.None;
myImage2.Margin = new Thickness(20);
' Get the palette from an image
Dim image2 As New BitmapImage()
image2.BeginInit()
image2.UriSource = New Uri("tulipfarm.tif", UriKind.RelativeOrAbsolute)
image2.EndInit()
Dim myPalette3 As New BitmapPalette(image2, 256)
'Draw the third Image
Dim myImage2 As New Image()
myImage2.Source = image2
myImage2.Stretch = Stretch.None
myImage2.Margin = New Thickness(20)
Only Tagged Image File Format (TIFF) and Graphics Interchange Format (GIF) image formats support image palettes. However, other image types can be used to define a BitmapPalette. Attempting to define a BitmapPalette for an unsupported bitmap format does not result in an exception; the designated BitmapPalette is simply ignored.
Windows Presentation Foundation (WPF) supports both custom color palettes and predefined palettes defined by the BitmapPalettes class.
Bitmap |
Initializes a new instance of the BitmapPalette class based on the specified BitmapSource. The new BitmapPalette is limited to a specified maximum color count. |
Bitmap |
Initializes a new instance of the BitmapPalette class with the specified colors. |
Colors |
Get the colors defined in a palette. |
Dispatcher |
Gets the Dispatcher this DispatcherObject is associated with. (Inherited from DispatcherObject) |
Check |
Determines whether the calling thread has access to this DispatcherObject. (Inherited from DispatcherObject) |
Equals(Object) |
Determines whether the specified object is equal to the current object. (Inherited from Object) |
Get |
Serves as the default hash function. (Inherited from Object) |
Get |
Gets the Type of the current instance. (Inherited from Object) |
Memberwise |
Creates a shallow copy of the current Object. (Inherited from Object) |
To |
Returns a string that represents the current object. (Inherited from Object) |
Verify |
Enforces that the calling thread has access to this DispatcherObject. (Inherited from DispatcherObject) |
Product | Versions |
---|---|
.NET Framework | 3.0, 3.5, 4.0, 4.5, 4.5.1, 4.5.2, 4.6, 4.6.1, 4.6.2, 4.7, 4.7.1, 4.7.2, 4.8, 4.8.1 |
Windows Desktop | 3.0, 3.1, 5, 6, 7, 8, 9 |
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