4 bit PNG display issue

Dear all,
I am using sun jvm pbp1.0.2-linux-x86.
I have written a test apps which will display a png image by reading the file. But when i executed the program White colour in the png is shown as blue colour. The point to be noted here is that the bit depth of the png is 4.
I there any display issues in the 4 bit PNG images.
I am also facing this problem in the jdk version 1.4 in linux and windows.
But the image is dispalyed correctly in jdk 1.5 version.
Is there any fix need to apply in my jvm to render the 4 bit PNG image correctly.
Waiting for your kind cooperation
Regards
Sivan

Dear all,
The error is fixed.
With reference to Bug ID: 4809676 of SUN bug database, applied one patch in the code
In the source code of sun.awt.image.PNGImageDecoder, please see 436 line.
Near the end of the line, ... &7 is present.
Actually 7 should have been 15. Otherwise, some PNG images
with bitdepth 4 won't be decoded correctly. Showing incorrect colors.
case 4:
bPixels[col+rowOffset] = (byte)((rowByteBuffer[spos>>1]>>
((1-(spos&1))*4))&7); // --> Replace &7 to &15
spos++;
break;
Regards
Sivan

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