ArrayIndexOutOfBoundsException 1924 about java-image-scaling

[GoogleCodeExporter]

I'm unable to reproduce the problem in 0.8.2 (just released). I suspect the 
error
report is about 0.8.1 (even though is says 0.8.2).
I case I'm wrong, please provide me with a full code example (I'm currently 
using the
one below):

BufferedImage image2D = 
ImageIO.read(getClass().getResourceAsStream("issue11.jpg"));
DimensionConstrain dc = DimensionConstrain.createMaxDimension(604,604, true);
ResampleOp  resampleOp = new ResampleOp (dc);
BufferedImage rescaledTomato = resampleOp.filter(image2D, null);

Original comment by m%[email protected] on 3 Nov 2009 at 2:42

• Changed state: WontFix

[GoogleCodeExporter]

I downloaded 8.3 jar and works with no exception now. However the rescaling 
seem to
have reduce some quality of the original. I have attached the rescaled of the
previous attached photo. There are extra white shadow around the white part of 
the
picture which dont exist from the original.

Here is the code i use:

BufferedImage bi = ImageIO.read(src);

         DimensionConstrain dc =DimensionConstrain.createMaxDimension(604,604, true);
       ResampleOp resampleOp = new ResampleOp(dc);

            resampleOp.setUnsharpenMask(AdvancedResizeOp.UnsharpenMask.Soft);
            BufferedImage rescaled = resampleOp.filter(bi,null);

             File outfile = new File("/Users/charlie/Development/java/playSe/"+ file
+".jpg");
            javax.imageio.ImageIO.write(rescaled, "jpg", outfile);

Original comment by [email protected] on 5 Nov 2009 at 10:08

Attachments:

• wallthumd.jpg

[GoogleCodeExporter]

Ok. It seems to be a problem. It must be related to the file format (Grayscale
jpegs). If the source image is saved as png, there is no problem.

The wierd thing is that in my IDE (IntelliJ) there is actually also white noise 
on
the source image as well.

I'll look at it.

Original comment by m%[email protected] on 11 Nov 2009 at 8:19

• Changed state: Accepted

[GoogleCodeExporter]

I figured out what is wrong. The rescale works as intended - the white shadows 
is
created by the jpeg compression.

To fix it simply choose a lossless format (such as png) or increase the jpeg 
quality
using the following code:
private void saveHighqualityJpeg(BufferedImage rescaledTomato, String filename)
throws IOException {
        ImageWriter writer = null;
        Iterator iter = ImageIO.getImageWritersByFormatName("jpg");
        if (iter.hasNext()) {
            writer = (ImageWriter)iter.next();
        }

        FileOutputStream fos = new FileOutputStream(filename);
        ImageOutputStream ios = ImageIO.createImageOutputStream(fos);
        writer.setOutput(ios);
        ImageWriteParam iwparam = writer.getDefaultWriteParam();
        iwparam.setCompressionMode(ImageWriteParam.MODE_EXPLICIT) ;
        System.out.println(iwparam.getCompressionQuality()) ;
        iwparam.setCompressionQuality(1.0f) ;
        writer.write(null, new IIOImage(rescaledTomato, null, null), iwparam);
        writer.dispose();
        ios.close();
        fos.close();
    }

Original comment by m%[email protected] on 29 Dec 2009 at 7:19

• Changed state: Fixed