CMY is short for cyan, magenta and yellow(the compliments of red, green and blue.) It is a color model similar to RGB but reversed. Cyan, magenta and yellow are subtractive primaries. In RGB, you specify how much red, green and blue you want to add to black. In CMY, you specify how much cyan, magenta and yellow you want to subtract from white. It is mostly used with inkjet printers. Here's the quick way for converting RGB to CMY:

|R|    |1|   |C|
|G| =  |1| - |M|
|B|    |1|   |Y|

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