FULL PRODUCT VERSION :
java version " 1.7.0_09 "
Java(TM) SE Runtime Environment (build 1.7.0_09-b05)
Java HotSpot(TM) Client VM (build 23.5-b02, mixed mode, sharing)

not specific to that version

ADDITIONAL OS VERSION INFORMATION :
Microsoft Windows [Version 6.1.7601]

EXTRA RELEVANT SYSTEM CONFIGURATION :
not specific

A DESCRIPTION OF THE PROBLEM :
When a BufferedImage is written
to a JPEG file all colors are garbled if the BufferdImage
contains an alpha channel. As JPEG does not support
an alpha channel the writer should just ignore it
but otherwise leave the colors intact.

This bug is especially critical for JavaFX users because
all JavaFX images converted to BufferedImages do contain
an alpha channel and converting to a BufferdImage and writing
in out via ImageIO is the only way to write an image in JavaFX.

This was also reported as:
http://javafx-jira.kenai.com/browse/RT-23502

STEPS TO FOLLOW TO REPRODUCE THE PROBLEM :
Run the attached test program

EXPECTED VERSUS ACTUAL BEHAVIOR :
EXPECTED -
Correct colors in all images
ACTUAL -
Wrong colors in all JPEG images which were created from BufferedImages with an alpha channel.

REPRODUCIBILITY :
This bug can be reproduced always.

---------- BEGIN SOURCE ----------
package bugs.jpeg;

import java.awt.Color;
import java.awt.Graphics2D;
import java.awt.image.BufferedImage;
import java.io.File;
import java.io.IOException;

import javax.imageio.ImageIO;

/**
 * This test program demonstrates a critical bug in the
 * JPEG writer of ImageIO. When a BufferedImage is written
 * to a JPEG file all colors are garbled if the BufferdImage
 * contains an alpha channel. As JPEG does not support
 * an alpha channel the writer should just ignore it
 * but otherwise leave the colors intact.
 *
 * This bug is especially critical for JavaFX users because
 * all JavaFX images converted to BufferedImages do contain
 * an alpha channel and converting to a BufferdImage and writing
 * in out via ImageIO is the only way to write an image in JavaFX.
 *
 * This was also reported as:
 * http://javafx-jira.kenai.com/browse/RT-23502
 *
 * @author M. Paus
 */
public class ImageIOJpegBug {

static final String IMG_FORMAT = " jpeg " ;

static final int[] IMG_TYPES = new int[]{
BufferedImage.TYPE_INT_RGB,// 1 - ok
BufferedImage.TYPE_INT_ARGB,// 2 - wrong
BufferedImage.TYPE_INT_ARGB_PRE,// 3 - wrong
BufferedImage.TYPE_INT_BGR,// 4 - ok
BufferedImage.TYPE_3BYTE_BGR,// 5 - ok
BufferedImage.TYPE_4BYTE_ABGR,// 6 - wrong
BufferedImage.TYPE_4BYTE_ABGR_PRE,// 7 - wrong
BufferedImage.TYPE_USHORT_565_RGB,// 8 - ok
BufferedImage.TYPE_USHORT_555_RGB,// 9 - ok
};

public static void main(String[] args) {
for (int imgType : IMG_TYPES) {
BufferedImage bi = new BufferedImage(600, 400, imgType);
Graphics2D g2 = (Graphics2D)bi.getGraphics();
g2.setColor(Color.WHITE);
g2.fillRect(0, 0, bi.getWidth(), bi.getHeight());
g2.setColor(Color.RED);
g2.drawString( " RED " , 100, 100);
g2.setColor(Color.GREEN);
g2.drawString( " GREEN " , 200, 200);
g2.setColor(Color.BLUE);
g2.drawString( " BLUE " , 300, 300);
try {
String filename = " image_type " + imgType + " . " + IMG_FORMAT;
ImageIO.write(bi, IMG_FORMAT, new File(filename));
System.out.println(filename + " written. " );
} catch (IOException e) {
e.printStackTrace();
}
}
}

}

---------- END SOURCE ----------

CUSTOMER SUBMITTED WORKAROUND :
Convert to a BufferedImage without alpha but this is a cludge for JavaFX users.