> Try upgrading to ImageJ 1.37b or later. It averages source pixels when
> RGB images are reduced by more than 4:1, resulting in better looking
> thumbnails. It also helps to enhance the contrast, which you can do
> using something like
>
> (new ContrastEnhancer()).stretchHistogram(imp2, 0.05);
>
> or like this in a macro
>
> run("Enhance Contrast", "saturated=0.05");
>
> -wayne
>
>
> On May 30, 2006, at 11:04 AM, TDLN wrote:
>
> > I recently switched from using javax.imageio to ImageJ and I am
> > running into several basic issues. I hope some of you can help me out.
> >
> > The requirements are a multi threaded webcrawler that is generating
> > thumbnails from URL's to Image files (jpg, png and gif). The
> > thumbnails are written to a predefined directory on the file system.
> > Thumbnails should be 100px*100px; we need the best possible quality.
> > File size of the generated thumbails is not so important. Performance
> > is crucial though. Processing should be done in the backgroung (no
> > gui).
> >
> > I started with this code.
> >
> > ImagePlus ip = new ImagePlus(imageUrl);
> > ImageProcessor imp = ip.getProcessor();
> > ImageProcessor imp2 = imp.resize(THUMB_WIDTH, THUMB_HEIGHT);
> > imp2.setInterpolate(true);
> > ImagePlus ip2 = new ImagePlus("Resized Image", imp2);
> > FileSaver fs = new FileSaver(ip2);
> > JpegWriter.setQuality(100);
> > fs.saveAsJpeg();
> >
> > Performance is OK, but the quality of the generated thumbnails is not
> > so good.
> >
> > Then I read this thread that has some info on improving the quality of
> > the generated thumbnails:
> >
https://list.nih.gov/cgi-bin/wa?A2=ind0512&L=IMAGEJ&P=R2440&I=-3> >
> > I tried both IJ.run("","") and IJ.runMacro(String macro) style syntax.
> >
> > Both give me different types of errors:
> >
> > - Image locked errors
> > - A window pops up and no thumbnail is generated
> > - Runtime exceptions
> >
> > Some thumbs are generated though and they are much better quality than
> > before, reason I like to ge this code working.
> >
> > Now, I think my problems are related to threading issues. I am very
> > new to ImageJ and probably my question shows my basic ignorance. Still
> > I hope some of you read so far and can give me some hints or pointers
> > to some examples.
> >
> > Rgrds. Thomas Delnoij
> >
>