How to set color depth to Bitmap image with Java advance Imaging

i have to convert image one format ot bmp format and also set the color depth as 1 bit , 4 bit , 8 bit, 16 bit, 32 bit of image.
has any one done this before. please help me out .

Take a look at the example code here: http://forum.java.sun.com/thread.jsp?forum=20&thread=560573&tstart=0&trange=15
I took an image that was 24 bits/pixel (I guess) and converted it to an indexed color model (8 bits/pixel).
Is that what you mean? (It's also easy to convert to 16 or 15 bits/pixel: use TYPE_USHORT_565_RGB or
TYPE_USHORT_555_RGB.)

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