Name: cc94850 Date: 07/21/2004


FULL PRODUCT VERSION :
java version "1.5.0-beta3"
Java(TM) Runtime Environment, Standard Edition (build 1.5.0-beta3-b58)
Java HotSpot(TM) Client VM (build 1.5.0-beta3-b58, mixed mode, sharing)

A DESCRIPTION OF THE PROBLEM :
Using ImageIO.write(RenderedImage, "BMP", File) you will get a BMP file representing a 32 bit image even when the source image is only 24 bits per pixel.


EXPECTED VERSUS ACTUAL BEHAVIOR :
EXPECTED -
A 24 bpp BMP file
ACTUAL -
A 32 bpp BMP file

REPRODUCIBILITY :
This bug can be reproduced always.

---------- BEGIN SOURCE ----------
import java.awt.Color;
import java.awt.Graphics;
import java.awt.Graphics2D;
import java.awt.image.BufferedImage;
import java.io.File;
import java.io.IOException;

import javax.imageio.ImageIO;

/*
 * Created on Jul 21, 2004 by scottpalmer
 */

/**
 * @author scottpalmer
 *
 */
public class ImageIOBMP {

public static void main(String[] args) throws IOException {
// Create a 24-bit image
BufferedImage img = new BufferedImage(720,480,BufferedImage.TYPE_INT_RGB);
// give it some content
Graphics2D g = (Graphics2D) img.getGraphics();
g.setColor(Color.RED);
g.fillOval(0,0,img.getWidth(),img.getHeight());
g.setColor(Color.GREEN);
g.fillOval(100,100,img.getWidth()-200,img.getHeight()-200);
g.setColor(Color.BLUE);
g.fillOval(200,200,img.getWidth()-400,img.getHeight()-400);
g.dispose();

// Write it out with ImageIO BMP writer
String filename = "ShouldBe24Bit.bmp";
String format = "BMP";

ImageIO.write(img,format, new File(filename));

System.out.println("Created \""+filename+"\"");
System.out.println("Size should be about 1MB, if it is closer to 1.3MB an alpha channel was written.");;
System.out.println("Size of \""+filename+"\" is "+new File(filename).length());
}
}

---------- END SOURCE ----------
(Incident Review ID: 286713)
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