Read and write images in pixels in java -

i trying read , write grayscale image using bufferedimage. pixels in writing images little bit different source. not image processing stuff. please me find mistake have made in code.

here code

file inimage=new file("source.jpg"); file outimage=new file("out.jpg");  /* code reading image*/ bufferedimage image=imageio.read(inimage); writableraster raster=image.getraster();  /*  writing same raster new image */ bufferedimage newimg=new bufferedimage(raster.getwidth(), raster.getheight(),bufferedimage.type_byte_gray);                 newimg.setdata(raster); imageio.write(newimg, "jpg", outimage); 

i'm sure original image not of type type_byte_gray. suggest output same image type input one:

bufferedimage newimg = new bufferedimage(raster.getwidth(), raster.getheight(), image.gettype());