How to use a grayscale color model in converting a colored image

how to convert a colored image into grayscale using :
ColorSpace cs = ColorSpace.getInstance(ColorSpace.CS_GRAY);
int bits[] = new int[] {8};
ColorModel cm = new ComponentColorModel(cs, bits, false, false,
Transparency.OPAQUE,
DataBuffer.TYPE_BYTE);
please only this method , i don't need the "bandcombine" method cause i need to know that i have exact 256 grayscale colors, thanx in advance.

I went into mail preferences in the first place. I found the fonts and colors and picked the color I want but it doesn;t seem to be sticking?

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