Error scaling png, still not working about java-image-scaling

[GoogleCodeExporter]

Unable to reproduce (However not that the Easizer is not up-to-date!)

I have attached a testcase (with version 0.8.4 downloaded from 
http://code.google.com/p/java-image-scaling/ ) that works on my machine.

Please let me know if you still have problems.

Original comment by m%[email protected] on 26 Mar 2010 at 7:33

• Changed state: Fixed

Attachments:

• Archive.zip

[GoogleCodeExporter]

I'm using version 0.8.4 and experienced the same problem.

 int maxheightwidth  = 150;
                BufferedImage img = ImageIO.read(new ByteArrayInputStream(data));
            int width = img.getWidth();
            int height = img.getHeight();

            if (height > maxheightwidth || width > maxheightwidth) {
                if (height > width) {
                    // height > width
                    float ratio = (float) maxheightwidth / height;
                    height = maxheightwidth;
                    width = (int) (ratio * width);
                } else {
                    float ratio = (float) maxheightwidth / width;
                    width = maxheightwidth;
                    height = (int) (ratio * height);
                }

                // image = image.scaleImage(width, height);

            }

            ResampleOp resampleOp = new ResampleOp(width, height);
            resampleOp.setNumberOfThreads(4);

            resampleOp.setUnsharpenMask(AdvancedResizeOp.UnsharpenMask.Normal);
            BufferedImage rescaledImage = resampleOp.filter(img, null);

            ByteArrayOutputStream b = new ByteArrayOutputStream();
            ImageIO.write(rescaledImage, this.format.toLowerCase(), b);

            data = b.toByteArray();

Original comment by [email protected] on 15 Apr 2010 at 10:53

Attachments:

• robert_johnson.gif
• robert_johnson.gif.new.jpg

[GoogleCodeExporter]

Thanks for the feedback. 

What version of Java are you using? And on what platform?

Original comment by m%[email protected] on 16 Apr 2010 at 5:58

• Changed state: Accepted

[GoogleCodeExporter]

I tested this on debian (64 bit):

java version "1.6.0_12"
Java(TM) SE Runtime Environment (build 1.6.0_12-b04)
Java HotSpot(TM) 64-Bit Server VM (build 11.2-b01, mixed mode)

and on my local windows 7 machine (64bit):
jdk1.6.0_19 (32 bit as I only had 32 bit imagemagick ddl available)

Original comment by [email protected] on 16 Apr 2010 at 12:37

[GoogleCodeExporter]

I can reproduce it with the following test case. If you output the rescaled 
image as
png, the problem doesn't occur!

I also ran this in a fresh project (with only the filter, junit and 
image-scaling
library), so it's definitely not some jar library conflict.

Original comment by [email protected] on 16 Apr 2010 at 1:40

Attachments:

• error.zip

[GoogleCodeExporter]

I'm pretty sure that the problem only occur if both rescale the image and 
change from
one image type to another. 

Original comment by m%[email protected] on 16 Apr 2010 at 2:11

[GoogleCodeExporter]

I can confirm that keeping same image format is reasonable workaround, and to 
get format name just use the following code: 

ByteArrayInputStream byteInputStream = new ByteArrayInputStream(img.imgData);
ImageInputStream imageInputStream = 
ImageIO.createImageInputStream(byteInputStream);
Iterator<ImageReader> imageReaders = ImageIO.getImageReaders(imageInputStream);
BufferedImage bigImg = ImageIO.read(imageInputStream);
String formatName;
if(imageReaders.hasNext())
    {
    ImageReader imageReader = imageReaders.next();
    formatName = imageReader.formatName;
}

Original comment by [email protected] on 21 Nov 2010 at 10:06

[GoogleCodeExporter]

I'm closing this bug, since I believe the bug relates to the ImageIO more than 
ImageScaling library. 

Original comment by m%[email protected] on 5 Feb 2011 at 1:43

• Changed state: WontFix

[GoogleCodeExporter]

So if someone has to do it how can it be done?

Original comment by [email protected] on 20 Apr 2011 at 9:14

[GoogleCodeExporter]

You can use the workaround suggested by marcin:
http://code.google.com/p/java-image-scaling/issues/detail?id=18#c7

Original comment by m%[email protected] on 20 Apr 2011 at 7:04