Re: getBufferedImage() in ImagePlus returns wrong type

Posted by Wayne Rasband on Oct 09, 2009; 4:16pm
URL: http://imagej.273.s1.nabble.com/getBufferedImage-in-ImagePlus-returns-wrong-type-tp3690882p3690883.html

This bug is fixed in the v1.43h daily build.

-wayne


________________________________________
From: Harry Oswald
Sent: Friday, October 09, 2009 6:24 AM
To: List IMAGEJ

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.