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
Locked
