BufferedImage 1-bit-per-pixel

[Orna Vel]

I am trying to create the application with "compact" BufferedImage which uses just 1 bit per pixel. But it does not work properly - it looks like it still uses a byte per pixel. Any thoughts?

 class BWBufImagePanel extends JPanel{

  BufferedImage fBufferedImage = null;
  
  int fWidth = 10, fHeight = 10;
  byte [] data = null;  
  
   /** Build a BufferedImage from a pixel array. **/
  void makeImage () {
 
    
    System.out.println("Size:" + fWidth +  " : " + fHeight);
    
    data = new byte[fWidth * fHeight];
    
    for (int i = 0; i < fWidth*fHeight; 
     data[i]=(byte)(i%2), i++);    
    
     byte[] bw = {(byte) 0xff, (byte) 0};
IndexColorModel blackAndWhite = new IndexColorModel(
1, 2, bw, bw, bw);

     fBufferedImage = new BufferedImage(
fWidth, fHeight,
BufferedImage.TYPE_BYTE_BINARY, 
blackAndWhite);
 
   // Get the writable raster so that data can be changed.
   WritableRaster wr = fBufferedImage.getRaster();
 
    // Now write the byte data to the raster
    wr.setDataElements (0, 0, fWidth, fHeight, data);
   
    
  }
 
  /** Draw the image on the panel. **/
  public void paintComponent (Graphics g) {
    super.paintComponent (g);
    if (fBufferedImage!= null) 
        g.drawImage (fBufferedImage, 0, 0, this );
  } // makeImage
 
} // class BWBufImagePanel 

[ March 31, 2005: Message edited by: Orna Vel ]

[Orna Vel]

I think this code works properly:

 import javax.swing.*;
import java.awt.*;
import java.awt.image.*;
 

class BWBufImagePanel extends JPanel{

  BufferedImage fBufferedImage = null;
  
  int fWidth = 100, fHeight = 100;
  byte [] data = null;
  int bytesPerRow = fWidth/8 + (fWidth%8!=0?1:0);
  
  
 
  /** Build a BufferedImage from a pixel array. **/
  void makeImage () {
 
    
    System.out.println("Size:" + fWidth +  " : " + fHeight);
   
    data = new byte[fHeight * bytesPerRow];
    
    for (int i = 0; i < data.length; data[i]=(byte)170 ,
     System.out.print(" : " + data[i]), i++);
    
    System.out.println();
 
byte[] bw = {(byte) 0xff, (byte) 0};
IndexColorModel blackAndWhite = new IndexColorModel(
1, // One bit per pixel
2, // Two values in the component arrays
bw, // Red Components
bw, // Green Components
bw);// Blue Components
 
DataBuffer db = new DataBufferByte( data, data.length);
  
 
    // Get the writable raster so that data can be changed.
    WritableRaster wr = Raster.createPackedRaster(db, fWidth, fHeight, 1, null);
    
    // Create the BufferedImage
    fBufferedImage = new BufferedImage(blackAndWhite, wr, true, null);
 
  }
 
  /** Draw the image on the panel. **/
  public void paintComponent (Graphics g) {
    super.paintComponent (g);
    if (fBufferedImage != null) 
        g.drawImage (fBufferedImage, 0, 0, this );
  } // makeImage
 
} // class BWBufImagePanel