Re: getBufferedImage() in ImagePlus returns wrong type

Posted by Albert Cardona-2 on Oct 09, 2009; 3:20pm
URL: http://imagej.273.s1.nabble.com/getBufferedImage-in-ImagePlus-returns-wrong-type-tp3690882p3690884.html

Harry,

All you want:

ImagePlus imp = IJ.openImage("F:\\myimgs\\Picture 001.jpg");

imp.setProcessor(imp.getTitle(),
                 imp.getProcessor().convertToByte(false));

IJ.log("image type: " + imp.getType());

BufferedImage bi = imp.getProcessor().getBufferedImage();

IJ.log("bi type: " + bi.getType());


Albert




Harry Oswald wrote:

>  hi
>  I tried to convert an image to 8bit grayscale using imageJ api.
>  The code snippet is as follows
>
>  ..
>  import ij.IJ;
>  import ij.ImagePlus;
>  import ij.process.ImageConverter;
>  import java.awt.image.BufferedImage;
>  ....
>
>  public static void toGrayscale(){
>     ImagePlus imp=new ImagePlus("F:\\myimgs\\Picture 001.jpg");
>     if (imp.getType() == ImagePlus.GRAY8){
>         System.out.println("gray8");
>     }else{
>      System.out.println("orig image color mode="+imp.getType());
>      ImageConverter ic = new ImageConverter(imp);
>      ic.convertToGray8();
>      IJ.saveAs(imp, "png", "F:\\myimgs\\newimage.png");
>      BufferedImage bufferedImage=imp.getBufferedImage();
>      if (imp.getType() == ImagePlus.GRAY8){
>          System.out.println("after conversion, type is gray8");
>             System.out.println("bufferedImage type
>  is="++bufferedImage.getType());
>      }else{
>          System.out.println("still imp is="+imp.getType());
>                 System.out.println("bufferedimg type
>  is="+bufferedImage.getType());
>
>          }          
>            
>  }
>
>  however ,when I run this using a truecolor image,I get the following

output.

>
>  orig image color mode=4    //     COLOR_RGB as per ImageJ docs
>  after conversion, type is gray8
>  bufferedimg type is=13      // TYPE_BYTE_INDEXED as per jdk doc
>
>  I am confused by the value 13.Shouldn't it be 10 viz TYPE_BYTE_GRAY ?can
>  someone tell me
>
>  why this is happening?
>  thanks a lot
>  harry.

--
Albert Cardona
http://albert.rierol.net