Class GreyImage


  • public class GreyImage
    extends java.lang.Object
    A greyscale image backed by a a byte buffer. The buffer is initially set to zero values, corresponding to black. White corresponds to byte values of 255. Trial and error suggests that it is more efficient in time, though not in memory, to use greyscale than bitmap images (BufferedImage.TYPE_BYTE_BINARY), even if only bitmap type values are required.
    Since:
    26 Nov 2013
    Author:
    Mark Taylor
    See Also:
    GraphicsBitmap, RgbImage
    • Method Summary

      All Methods Static Methods Instance Methods Concrete Methods 
      Modifier and Type Method Description
      static GreyImage createGreyImage​(int width, int height)
      Factory method to create an instance.
      Pixer createPixer()
      Returns a pixel iterator that iterates over all the pixels that have been altered (are non-white) in this image.
      byte[] getBuffer()
      Returns the byte array backing the image.
      java.awt.image.BufferedImage getImage()
      Returns the greyscale image.
      • Methods inherited from class java.lang.Object

        clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait
    • Method Detail

      • getImage

        public java.awt.image.BufferedImage getImage()
        Returns the greyscale image.
        Returns:
        image
      • getBuffer

        public byte[] getBuffer()
        Returns the byte array backing the image.
        Returns:
        byte array
      • createPixer

        public Pixer createPixer()
        Returns a pixel iterator that iterates over all the pixels that have been altered (are non-white) in this image. In the current implementation this is not efficient to be re-used.
        Returns:
        iterator over non-white pixels
      • createGreyImage

        public static GreyImage createGreyImage​(int width,
                                                int height)
        Factory method to create an instance.
        Parameters:
        width - image width in pixels
        height - image height in pixels