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since Feb 22, 2006

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Recent posts by neil up

Image smoothing

sorry, i forgot to post the methods i said:

private BufferedImage toBufferedImage(Image image)
{
System.out.println("starting toBuff...");
//image = new ImageIcon(image).getImage();
//System.out.println("icon created.");
BufferedImage bufferedImage = new BufferedImage(image.getWidth(null)
,image.getHeight(null),BufferedImage.TYPE_INT_RGB);//TYPE_USHORT_565_RGB
System.out.println("image buffed.");
java.awt.Graphics g = bufferedImage.createGraphics();
System.out.println("graphics.");
g.setColor(Color.white);
g.fillRect(0,0,image.getWidth(null),image.getHeight(null));
System.out.println("drawing...");
g.drawImage(image,0,0,null);
System.out.println("drawn");
g.dispose();
System.out.println("returning toBuff...");
return bufferedImage;
}
//uses getScaledInstance, then converts image to buffered image for jpeg output. Fantastic but SLOW becuse of the conversion from Image to BufferedImage ??? i dunno why...
private int processImage(String sFileName,String imageDir, String imageOutputDir, String sSetScaleBy , int iMaxDim, String sNameAdj)
{
try {
// Retrieve jpg image to be compressed
InputStream is = new FileInputStream(imageDir+"/"+sFileName);
BufferedImage bufImage = ImageIO.read(is);
System.out.println("Image buffered!");
float scale = Float.parseFloat( ""+iMaxDim ) / Float.parseFloat( ""+ bufImage.getWidth() );
System.out.println("Image W:"+bufImage.getWidth()+" H:"+ bufImage.getHeight() +" scale:"+ scale );
System.out.println("Image scaling...");
Image resizedImg = bufImage.getScaledInstance( (int)(bufImage.getWidth() * scale) , (int)(bufImage.getHeight() * scale ), Image.SCALE_AREA_AVERAGING );
System.out.println("Image scaled!");
BufferedImage newImage = toBufferedImage( resizedImg );
is.close();
FileOutputStream fos = new FileOutputStream(imageOutputDir+"/"+sFileName.substring(0,sFileName.lastIndexOf("."))+sNameAdj+".jpg");
System.out.println("opened stream to: "+imageOutputDir+"/"+sFileName.substring(0,sFileName.lastIndexOf("."))+sNameAdj+".jpg"+"<br>");
JPEGImageEncoder encoder = JPEGCodec.createJPEGEncoder( fos );
// The default quality is 0.75.
JPEGEncodeParam jep = JPEGCodec.getDefaultJPEGEncodeParam( newImage );
jep.setQuality( 0.8f, true );
System.out.println("Image encoding...");
encoder.encode(newImage, jep);
System.out.println("Image encoded");
fos.flush();
fos.close();
System.out.println("output complete");
} catch (Exception e) { System.out.println("error: "+e);
}
return 1;
}
//this one is super fast, but quality is dissapointing.
private int processImage2(String sFileName,String imageDir, String imageOutputDir, String sSetScaleBy , int iMaxDim, String sNameAdj)
{
try {
// load image from INFILE
java.awt.Image img = Toolkit.getDefaultToolkit().getImage(imageDir+"/"+sFileName);
MediaTracker mediaTracker = new MediaTracker(new Container());
mediaTracker.addImage(img, 0);
mediaTracker.waitForID(0);
//get scales
float scale = Float.parseFloat( ""+iMaxDim ) / Float.parseFloat( ""+ img.getWidth(null) );
System.out.println("Image scaling...");
//Image resizedImg = bufImage.getScaledInstance( (int)(image.getWidth() * scale) , (int)(image.getHeight() * scale ), Image.SCALE_AREA_AVERAGING );
int iWidthNew= (int)(img.getWidth(null) * scale);
int iHeightNew = (int)(img.getHeight(null) * scale );
System.out.println("Image W:"+img.getWidth(null)+" H:"+ img.getHeight(null) +" scale:"+ scale+" new W:"+iWidthNew+" H:"+iHeightNew );
BufferedImage buffImage = new BufferedImage( iWidthNew ,
iHeightNew , BufferedImage.TYPE_INT_RGB);
Graphics2D graphics2D = buffImage.createGraphics();
graphics2D.setRenderingHint(RenderingHints.KEY_INTERPOLATION,
RenderingHints.VALUE_INTERPOLATION_BICUBIC);
graphics2D.drawImage(img, 0, 0, iWidthNew, iHeightNew, null);
FileOutputStream fos = new FileOutputStream(imageOutputDir+"/"+sFileName.substring(0,sFileName.lastIndexOf("."))+sNameAdj+".jpg");
// save new image to OUTFILE
BufferedOutputStream out = new BufferedOutputStream( fos);
System.out.println("Image scaled!");
System.out.println("opened stream to: "+imageOutputDir+"/"+sFileName.substring(0,sFileName.lastIndexOf("."))+sNameAdj+".jpg"+"<br>");
JPEGImageEncoder encoder = JPEGCodec.createJPEGEncoder( fos );
// The default quality is 0.75.
JPEGEncodeParam jep = JPEGCodec.getDefaultJPEGEncodeParam( buffImage );
jep.setQuality( 0.8f, true );
System.out.println("Image encoding...");
encoder.encode(buffImage, jep);
System.out.println("Image encoded");
fos.flush();
fos.close();
System.out.println("output complete");
/*
// Find a jpeg writer
ImageWriter writer = null;
Iterator iter = ImageIO.getImageWritersByFormatName("jpg");
if (iter.hasNext()) {
writer = (ImageWriter)iter.next();
}
ImageTypeSpecifier ss = ImageTypeSpecifier(rendImage);
// Prepare output file
ImageOutputStream ios = ImageIO.createImageOutputStream( new java.io.File(imageOutputDir+"/"+sFileName.substring(0,sFileName.lastIndexOf("."))+sNameAdj+".jpg") );
writer.setOutput(ios);
// Set the compression quality
JPEGImageWriteParam iwparam1 =
(JPEGImageWriteParam) writer.getDefaultWriteParam(); //new MyImageWriteParam();
iwparam1.setCompressionMode(ImageWriteParam.MODE_EXPLICIT); //MODE_COPY_FROM_METADATA
javax.imageio.metadata.IIOMetadata ff ;
iwparam1.setCompressionQuality( 0.8f);
ff = writer.getDefaultImageMetadata(ss,iwparam1);
writer.write(ff, new IIOImage(rendImage, null, null), iwparam1);
// Cleanup
ios.flush();
writer.dispose();
ios.close();
*/
} catch (Exception e) { System.out.println("error: "+e);
}
return 1;
}
//here is yet another attempt in the hopes that ImageJ woudl work out //better, but no, it doesn't. same fast but poor output as version 2.
private int processImage3(String sFileName,String imageDir, String imageOutputDir, String sSetScaleBy , int iMaxDim, String sNameAdj)
{
try {
ImagePlus ip = new ImagePlus(imageDir+"/"+sFileName);
ImageProcessor imp = ip.getProcessor();
System.out.println("Image scaling...");
float scale = Float.parseFloat( ""+iMaxDim ) / Float.parseFloat( ""+ imp.getWidth() );
//Image resizedImg = bufImage.getScaledInstance( (int)(image.getWidth() * scale) , (int)(image.getHeight() * scale ), Image.SCALE_AREA_AVERAGING );
int iWidthNew= (int)(imp.getWidth() * scale);
int iHeightNew = (int)(imp.getHeight() * scale );
System.out.println("Image W:"+imp.getWidth()+" H:"+ imp.getHeight() +" scale:"+ scale+" new W:"+iWidthNew+" H:"+iHeightNew );
ImageProcessor imp2 = imp.resize(iWidthNew, iHeightNew);
ImagePlus ip2 = new ImagePlus("Resized Image", imp2);
System.out.println("Image scaled.");
FileSaver fs = new FileSaver(ip2);
fs.saveAsJpeg(imageOutputDir+"/"+sFileName.substring(0,sFileName.lastIndexOf("."))+sNameAdj+".jpg");
System.out.println("Image saved.");
} catch (Exception ex) { System.out.println("error: "+ex);
return 0;
}
return 1;
}

If anyone can help, thanks in advance. if anyone benefits from these examples great. lots of articles don't have the needed include statements and that sux. here they are for you as a jsp woudl need them:

19 years ago

Java in General

Image smoothing

as far as i know, you are going to get that exception. it will be thrown before the image is fully loaded in mem. there are posts aroudn the net on this specifically.

I am looking for a fast way to get high quality images resized and optimized and saved to disk as a jpeg. not in a jpanel. not low quality. not 256 color. yada yada. good output. i have gotten many examples to work from things all around the net, but they all produce the same poor albeit fast output.
for example, where light would highlight the texture of a leather, i get grainy harsh white pixels. yuck! here are three methods that all work.
the one that does a nice job takes 19s to convert from an image to a buffered image which is required to write as jpeg. does anyone know a way around this? unlike posts i have seen, Image resizedImg = bufImage.getScaledInstance( whatever) does not take long. it is the conversion from the returned Image to BufferedImage that takes so darn long.

any help would be appreciated. thanks.
-neil

19 years ago

Java in General