Name: rmT116609 Date: 09/07/2004


FULL PRODUCT VERSION :
java version "1.4.2_05"
Java(TM) 2 Runtime Environment, Standard Edition (build 1.4.2_05-b04)
Java HotSpot(TM) Client VM (build 1.4.2_05-b04, mixed mode)

java version "1.5.0-rc"
Java(TM) 2 Runtime Environment, Standard Edition (build 1.5.0-rc-b63)
Java HotSpot(TM) Client VM (build 1.5.0-rc-b63, mixed mode, sharing)

ADDITIONAL OS VERSION INFORMATION :
Microsoft Windows 2000 [Version 5.00.2195]

A DESCRIPTION OF THE PROBLEM :
An Exception occurs when using ImageIO to load some PNGs. Seems much more common with greyscale PNGs - I have a lot and it happens on about 5-10%. From multiple sources too (downloaded from internet). I haven't been able to create problem input files locally, however.

Looks identical to bug-id 4463483. The line numbers are different, but looks otherwise identical.

Every other image viewer I have can view the same files without any problem.

STEPS TO FOLLOW TO REPRODUCE THE PROBLEM :
This is all that's required:
ImageIO.read(file);

Where "file" is a path to a PNG file.

EXPECTED VERSUS ACTUAL BEHAVIOR :
EXPECTED -
  To get a java.awt.Image object
ACTUAL -
An exception is thrown


ERROR MESSAGES/STACK TRACES THAT OCCUR :
java.lang.IllegalArgumentException: LUT has improper length!
at javax.imageio.ImageTypeSpecifier$Indexed.<init>(ImageTypeSpecifier.java:866)
at javax.imageio.ImageTypeSpecifier.createIndexed(ImageTypeSpecifier.java:955)
at com.sun.imageio.plugins.png.PNGImageReader.getImageTypes(PNGImageReader.java:1463)
at com.sun.imageio.plugins.png.PNGImageReader.readImage(PNGImageReader.java:1348)
at com.sun.imageio.plugins.png.PNGImageReader.read(PNGImageReader.java:1530)
at javax.imageio.ImageIO.read(ImageIO.java:1400)
at javax.imageio.ImageIO.read(ImageIO.java:1286)
at slides.test.main(test.java:11)

REPRODUCIBILITY :
This bug can be reproduced always.

---------- BEGIN SOURCE ----------
package slides;

import java.awt.Image;
import java.io.File;
import javax.imageio.ImageIO;

public class test {
    public static void main(String[] args) {
        File file = new File(args[0]);
        try {
            Image img = ImageIO.read(file);
        } catch (Exception E) {
            E.printStackTrace();
        }
    }
}

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

CUSTOMER SUBMITTED WORKAROUND :
Re-saving problem input images in an image editor works - the file then loads/displays properly via ImageIO. However, this isn't possible for remote images, as well as being tedious for the end-user.
(Incident Review ID: 301679)
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