1. A computer-readable medium having computer-executable instructions for calculating the luminance value from an input image data, said input image data comprising a red (R) digital data value, a green (G) digital data value and a blue (B) digital data value, said luminance value calculation comprising: shifting said R digital data value to the left by one digital place value, producing a R intermediate digital data value; shifting said G digital data value to the left by two digital place values, producing a G intermediate digital data value; adding said R intermediate digital data value to said B digital value, producing a first intermediate value; adding G digital value to said G intermediate digital data value, producing a second intermediate value; adding said first intermediate value to said second intermediate value, producing a third intermediate value; and shifting said third intermediate value by three digital place values, producing said luminance value.