java - ImageIO.write() method and png -

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why imageio.write(bufferedimage_dest,"png",new file(filedest)); writes jpg (without transparency colour) file instead png?

added:

static bufferedimage createresizedcopy(image originalimage,                  int scaledwidth, int scaledheight,                  boolean preservealpha)     {         system.out.println("resizing...");         int imagetype = preservealpha ? bufferedimage.type_int_rgb : bufferedimage.type_int_argb;         bufferedimage scaledbi = new bufferedimage(scaledwidth, scaledheight, imagetype);         graphics2d g = scaledbi.creategraphics();         if (preservealpha) {                 g.setcomposite(alphacomposite.src);         }         g.drawimage(originalimage, 0, 0, scaledwidth, scaledheight, null);          g.dispose();         return scaledbi;     }     public static void scale(string src, int width, int height, string dest)      throws ioexception {    bufferedimage bsrc = imageio.read(new file(src));    bufferedimage bdest =       new bufferedimage(width, height, bufferedimage.type_int_argb);    bdest = createresizedcopy(bsrc, width, height, false);    imageio.write(bdest,"png",new file(dest));   }

added:

well, in main() function i've called 

scalejpg.scale((args[0],integer.parseint(args[1]),integer.parseint(args[2]), args[3]););

instead of

scalepng.scale((args[0],integer.parseint(args[1]),integer.parseint(args[2]), args[3]););

scalejpg similiar, previous class in folder.

i must discard notepad , use ide. question delete.

add

g.setrenderinghint(renderinghints.key_interpolation, renderinghints.value_interpolation_bilinear);

before g.drawimage(originalimage, 0, 0, scaledwidth, scaledheight, null);to createresizedcopy function.


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