J�rg
import java.util.*; import java.io.*; import java.net.*; import java.awt.*; import java.awt.image.*; import java.awt.color.*; import javax.imageio.*; import javax.imageio.stream.*;
public class JpegBug {
public static void main(String[] args) throws Exception {
// first load an image, create an ARGB BufferedImage and draw the image into it:
Image image = Toolkit.getDefaultToolkit().createImage(new URL("http://www.tu-darmstadt.de/hrz/hhlr/links/test.jpg";));
MediaTracker mt = new MediaTracker(new Container());
mt.addImage(image, 0);
try {
mt.waitForID(0);
} catch (InterruptedException e){
return;
}
BufferedImage buffered = new BufferedImage(image.getWidth(null), image.getHeight(null), BufferedImage.TYPE_INT_ARGB);
buffered.createGraphics().drawImage(image, 0, 0, null);
// new generate a jpeg from this image:
ImageWriter writer = null;
Iterator iter = ImageIO.getImageWritersByFormatName("jpeg");
if (iter.hasNext()) writer = (ImageWriter)iter.next();
if (writer != null) {
ImageOutputStream ios = null;
try {
// Prepare output file
File file = new File("output.jpeg");
if (file.exists()) file.delete();
ios = ImageIO.createImageOutputStream(file);
writer.setOutput(ios);
// Set some parameters
ImageWriteParam param = writer.getDefaultWriteParam();
param.setCompressionMode(ImageWriteParam.MODE_EXPLICIT);
param.setCompressionQuality(0.7f);
// set the source bands so that the codedc ignores the alpha band:
param.setSourceBands(new int[] {0, 1, 2});
// specify the correct desination type without alpha:
param.setDestinationType(
ImageTypeSpecifier.createPacked(ColorSpace.getInstance(ColorSpace.CS_sRG B),
0x00ff0000,
0x0000ff00,
0x000000ff,
0x0,
DataBuffer.TYPE_INT,
false
)
/*
ImageTypeSpecifier.createInterleaved(
ColorSpace.getInstance(ColorSpace.CS_sRGB),
new int[] {2, 1, 0},
DataBuffer.TYPE_BYTE,
false,
false
)
*/
);
// Write the image
writer.write(null, new IIOImage(buffered, null, null),
param);
// Cleanup
ios.flush();
} finally {
if (ios != null) ios.close();
writer.dispose();
}
}
}
}Am 23.03.2004 um 20:20 schrieb Chris Campbell:
On Mar 23, 2004, at 11:07 AM, J�rg Lehni wrote:I do not agree.
Okay. Like I said, please send me (off the list) a small testcase that reproduces the problem. Code snippets are not enough; we prefer to see a full testcase that we can compile easily and run.
If you're interested I can send you on of those images for analysis.
Yes, that would be very helpful, in addition to the testcase.
Thanks, Chris
Best
J�rg
Am 23.03.2004 um 19:40 schrieb Chris Campbell:
Hi J�rg,
This sounds a lot like 4836466, which we closed as "not a bug". See the report for more details:
http://developer.java.sun.com/developer/bugParade/bugs/4836466.html
Basically, it appears that many native apps have poor support for JPEG images with an alpha channel. If you can read back one of these images using IIO (ImageIO.read()) and everything displays properly, I'd say your issue is related to 4836466. If not, send me a small testcase containing your sample code (off the list) and I can take a look. Maybe there's a separate issue lurking out there...
Thanks, Chris
On Mar 22, 2004, at 12:39 PM, J�rg Lehni wrote:Thanks Jim!
That's how my latest code looks like, i simplified it a lot:
param.setSourceBands(new int[] {0, 1, 2});
param.setDestinationType(
ImageTypeSpecifier.createPacked(ColorSpace.getInstance(ColorSpace.CS _sRGB),
0x00ff0000,
0x0000ff00,
0x000000ff,
0x0,
DataBuffer.TYPE_INT,
false
)
);
But it still produces the same problems. The resulting jpeg files are strange, don't display correctly in some viewers and get much bigger in size than necessary.
If I use the workaround of copying the TYPE_INT_ARGB BufferedImage into a TYPE_INT_RGB BufferedImage and then generate the JPEG by just using the default settings, everything works fine.
It looks to me as if there is a bug in the JPEG codec.
What do you think?
J�rg
Am 17.03.2004 um 01:55 schrieb Jim Graham:
An image of TYPE_INT_ARGB uses a PackedColorModel with a Packed Raster with a TYPE_INT DataBuffer. It is incompatible with the Byte-based ComponentColorModel (and SampleModel) that you are creating. I'm not sure how these two pieces of data would interact in this case...
...jim
--On 03/15/04 22:40:12 +0100 J�rg Lehni wrote:if (bi.getType() == BufferedImage.TYPE_INT_ARGB) {
// create a new ColorModel with OPAQUE transparency and no
alpha channel.
ColorModel cm = new
ComponentColorModel(bi.getColorModel().getColorSpace(), false, false,
Transparency.OPAQUE, DataBuffer.TYPE_BYTE);
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![http://www.tu-darmstadt.de/hrz/hhlr/links/test.jpg"](http://www.tu-darmstadt.de/hrz/hhlr/links/test.jpg"){kind=link}