Re: problem to save an image in JPG format on linux
On 23 mar, 17:44, Knute Johnson <nos...@rabbitbrush.frazmtn.com>
wrote:
jm...@hotmail.fr wrote:
Hello
I used two libraries (ImageIO and com.sun.image.codec.jpeg)
to save in JPG format an image of my application
in both cases it works on windows but it doesn't on linux (I checked
that on
SUSE and REDHAT) : the result is a black image!
has anyone an explanation ?
thanks in advance
Jean-Marie
PS : below is my code
// creating the image of my application
Dimension dim = parentframe.getSize();
BufferedImage bi = new BufferedImage
(dim.width,dim.height,BufferedImage.TYPE_INT_BGR);
Graphics bg = bi.getGraphics();
parentframe.paintAll(bg);
// looking for the best quality
Iterator iter = ImageIO.getImageWritersByFormatName("JPG");
if (iter.hasNext()) {
ImageWriter writer = (ImageWriter) iter.next(=
);
ImageWriteParam iwp = writer.getDefaultWriteP=
aram();
iwp.setCompressionMode(ImageWriteParam.MODE_EXP=
LICIT);
float values[] = iwp.getCompressionQualityVal=
ues();
// Write one for each compression values
float maxvalue=Float.MIN_VALUE;
for (int i = 0, n = values.length; i < n; i=
++) {
maxvalue=Math.max(maxvalue, values[i]=
);
}
iwp.setCompressionQuality(maxvalue);
// writing into a file
File outFile = new File(_filename);
FileImageOutputStream output = new FileImageOutputStream(outFile);
writer.setOutput(output);
IIOImage image = new IIOImage(bi, null, null);
writer.write(null, image, iwp);
}
I remember a problem if the file you are writing to already exists. In
some old code I have, I delete the file if it exists before writing to it=
..
--
Knute Johnson
email s/nospam/knute2009/
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the pb is solved using Robot class ; here is the code :
Point origin = _parentframe.getLocationOnScreen();
Dimension size = _parentframe.getSize();
BufferedImage image = (new Robot()).createScreenCapture(new Rectangle
(origin, size));
File outFile = new File(_filename);
ImageIO.write(image, "png", outFile);
i wanted to use JPG format but PNG seems far more better
Jean-Marie