OptimizedPaletteQuantizerWu Method

public static OptimizedPaletteQuantizer Wu(
	int maxColors = 256,
	Color32 backColor = default,
	byte alphaThreshold = 128
)

Public Shared Function Wu ( 
	Optional maxColors As Integer = 256,
	Optional backColor As Color32 = Nothing,
	Optional alphaThreshold As Byte = 128
) As OptimizedPaletteQuantizer

public:
static OptimizedPaletteQuantizer^ Wu(
	int maxColors = 256, 
	Color32 backColor = Color32(), 
	unsigned char alphaThreshold = 128
)

static member Wu : 
        ?maxColors : int * 
        ?backColor : Color32 * 
        ?alphaThreshold : byte 
(* Defaults:
        let _maxColors = defaultArg maxColors 256
        let _backColor = defaultArg backColor new Color32()
        let _alphaThreshold = defaultArg alphaThreshold 128
*)
-> OptimizedPaletteQuantizer 

Parameters

maxColors  Int32  (Optional)

The upper limit of generated colors. Must be between 2 and 65536, inclusive bounds. This parameter is optional.
Default value: 256.

backColor  Color32  (Optional)

Colors with alpha above the alphaThreshold will be blended with this color before quantizing. The Color32.A field of the background color is ignored. This parameter is optional.
Default value: The default value of the Color32 type, which has the same RGB values as Color.Black.

alphaThreshold  Byte  (Optional)

Specifies a threshold value for the Color.A property, under which a quantized color is considered transparent. If 0, then the quantized colors will never be transparent. This parameter is optional.
Default value: 128.

Return Value

Bitmap bmpOriginal = Icons.Shield.ExtractBitmap(new Size(256, 256));
bmpOriginal.SaveAsPng(@"c:\temp\original.png");

IQuantizer quantizer = OptimizedPaletteQuantizer.Wu(256);
Bitmap bmpConverted = bmpOriginal.ConvertPixelFormat(PixelFormat.Format8bppIndexed, quantizer);
bmpConverted.SaveAsGif(@"c:\temp\converted.gif");

The example above produces the following result:

original.png
converted.gif

Reference