PNGImageWriter creates metadata with incorrect bitDepth

FULL PRODUCT VERSION :
java version " 1.7.0_17 "
Java(TM) SE Runtime Environment (build 1.7.0_17-b02)
Java HotSpot(TM) Client VM (build 23.7-b01, mixed mode, sharing)


ADDITIONAL OS VERSION INFORMATION :
Microsoft Windows XP [5.1.2600]

A DESCRIPTION OF THE PROBLEM :
I try to update the interlaceMethod attribute in PNG file (see the wpng05 example). When I insert IHDR in the javax_imageio_png_1.0 metadata, ImageWriter creates PNG containing illegal bitDepth=3.

STEPS TO FOLLOW TO REPRODUCE THE PROBLEM :
Compile and run the wpng05 example.

EXPECTED VERSUS ACTUAL BEHAVIOR :
EXPECTED -
The file should contain
bitDepth= " 1 " | " 2 " | " 4 " | " 8 " | " 16 " .

ACTUAL -
The file contains bitDepth=3 and program crashes because of this.

ERROR MESSAGES/STACK TRACES THAT OCCUR :
javax.imageio.metadata.IIOInvalidTreeException: Illegal value for attribute bitDepth!

REPRODUCIBILITY :
This bug can be reproduced always.

---------- BEGIN SOURCE ----------
package tests.images2;

import java.awt.image.*;
import javax.imageio.*;
import javax.imageio.metadata.*;
import java.util.Iterator;
import org.w3c.dom.*;

public class wpng05 {
public static void main(String args[]) {
BufferedImage image= new BufferedImage(500,500,BufferedImage.TYPE_3BYTE_BGR);
Iterator iter= ImageIO.getImageWritersByFormatName( " png " );
ImageWriter writer= (ImageWriter)iter.next();
ImageWriteParam iwp= writer.getDefaultWriteParam();
ImageTypeSpecifier typeSpecifier= new ImageTypeSpecifier(image);
IIOMetadata metadata= writer.getDefaultImageMetadata(typeSpecifier,iwp);
String[] names= metadata.getMetadataFormatNames();
int length= names.length;
for (int i = 0; i < length; i++) {
System.out.println( " BEFORE: Format name: " +names[i]);
Node root= metadata.getAsTree(names[i]);
displayMetadata(root);
};
for (int i = 0; i < length; i++) {
Node root= metadata.getAsTree(names[i]);
if (names[i].equals( " javax_imageio_png_1.0 " )) {
Node ihdr= getChildNode(root, " IHDR " );
if (ihdr == null) {
ihdr= new IIOMetadataNode( " IHDR " );
root.appendChild(ihdr);
};
IIOMetadataNode iioIHDR= (IIOMetadataNode)ihdr;
iioIHDR.setAttribute( " interlaceMethod " , " adam7 " );
// iioIHDR.setAttribute( " interlaceMethod " , " none " );
try {
metadata.mergeTree(names[i],root);
} catch (IIOInvalidTreeException e) {
System.out.printf( " (1) IIOInvalidTreeException: %s
 " ,e);
}
}
};
for (int i = 0; i < length; i++) {
System.out.println( " AFTER: Format name: " +names[i]);
Node root= metadata.getAsTree(names[i]);
displayMetadata(root);
};
for (int i= 0; i < length; i++) {
if (names[i].equals( " javax_imageio_png_1.0 " )) {
Node root= metadata.getAsTree(names[i]);
Node text= getChildNode(root, " tEXt " );
if (text == null) {
text= new IIOMetadataNode( " tEXt " );
root.appendChild(text);
};
Node textEntry= getChildNode(text, " tEXtEntry " );
if (textEntry == null) {
textEntry= new IIOMetadataNode( " tEXtEntry " );
text.appendChild(textEntry);
};
IIOMetadataNode iioTextEntry= (IIOMetadataNode)textEntry;
iioTextEntry.setAttribute( " keyword " , " comment " );
iioTextEntry.setAttribute( " value " , " This is a comment!!! " );
try {
metadata.mergeTree(names[i],root);
} catch (IIOInvalidTreeException e) {
System.out.printf( " (2) IIOInvalidTreeException: %s
 " ,e);
}
}
};
}
static Node getChildNode(Node node, String givenName) {
Node child= node.getFirstChild();
if (child == null) {
return null;
};
while (child != null) {
String childName= child.getNodeName();
if (childName.equals(givenName)) {
return child;
} else {
child= child.getNextSibling();
}
};
return null;
}
static void displayMetadata(Node root) {
displayMetadata(root,0);
}
static void displayMetadata(Node node, int level) {
indent(level);
System.out.print(node.getNodeName());
NamedNodeMap map= node.getAttributes();
if (map != null) {
int length= map.getLength();
for (int i= 0; i < length; i++) {
Node attr= map.item(i);
System.out.print(
 " " + attr.getNodeName() +
  " =\ " " + attr.getNodeValue() + " \ " " );
if (node.getNodeName().equals( " NumProgressiveScans " ) &&
attr.getNodeName().equals( " value " )) {
}
}
} else {
System.out.print( " NO MAP! " );
};
Node child= node.getFirstChild();
if (child == null) {
System.out.println( " " );
return;
};
System.out.println( " " );
while (child != null) {
displayMetadata(child, level + 1);
child= child.getNextSibling();
};
}
static void indent(int level) {
for (int i= 0; i < level; i++) {
System.out.print( " " );
}
}
}

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

CUSTOMER SUBMITTED WORKAROUND :
I don?t know!