程序包 org.meteoinfo.image.filter

类 QuantizeFilter

  • 所有已实现的接口:
    BufferedImageOp, Cloneable
    public class QuantizeFilter
extends WholeImageFilter
    A filter which quantizes an image to a set number of colors - useful for producing images which are to be encoded using an index color model. The filter can perform Floyd-Steinberg error-diffusion dithering if required. At present, the quantization is done using an octtree algorithm but I eventually hope to add more quantization methods such as median cut. Note: at present, the filter produces an image which uses the RGB color model (because the application it was written for required it). I hope to extend it to produce an IndexColorModel by request.

    • 字段详细资料

      • matrix

        protected static final int[] matrix
        Floyd-Steinberg dithering matrix.

    • 构造器详细资料

      • QuantizeFilter

        public QuantizeFilter()

    • 方法详细资料

      • setNumColors

        public void setNumColors​(int numColors)
        Set the number of colors to quantize to.
        参数:
        numColors - the number of colors. The default is 256.

      • getNumColors

        public int getNumColors()
        Get the number of colors to quantize to.
        返回:
        the number of colors.

      • setDither

        public void setDither​(boolean dither)
        Set whether to use dithering or not. If not, the image is posterized.
        参数:
        dither - true to use dithering

      • getDither

        public boolean getDither()
        Return the dithering setting
        返回:
        the current setting

      • setSerpentine

        public void setSerpentine​(boolean serpentine)
        Set whether to use a serpentine pattern for return or not. This can reduce 'avalanche' artifacts in the output.
        参数:
        serpentine - true to use serpentine pattern

      • getSerpentine

        public boolean getSerpentine()
        Return the serpentine setting
        返回:
        the current setting

      • quantize

        public void quantize​(int[] inPixels,
                     int[] outPixels,
                     int width,
                     int height,
                     int numColors,
                     boolean dither,
                     boolean serpentine)

      • filterPixels

        protected int[] filterPixels​(int width,
                             int height,
                             int[] inPixels,
                             Rectangle transformedSpace)
        从类复制的说明: WholeImageFilter
        Actually filter the pixels.
        指定者:
        filterPixels 在类中 WholeImageFilter
        参数:
        width - the image width
        height - the image height
        inPixels - the image pixels
        transformedSpace - the output bounds
        返回:
        the output pixels