How to 32 bit rgb to 16 bit rgb on programming language C#? [duplicate]

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Possible Duplicate:

How to convert bitmap image with 32bit to 16bit color quality in C#

I have problem.

I need to convert a 32bit RGB image to 16bit 开发者_开发问答RGB using c#.

Can anyone suggest a starting point for me?

Thanks

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Divide each R, G and B value by 2 ^ 16, or 65536 - shifting them 16 bits to the right (this may be a performance hint) - and then recombine the results.