Patent ID: 6741261
Filing Date: 2004-05-25
Classification: G06T,G09G

Abstract:
An apparatus for compositing first and second pixel values, said apparatus comprising:logic means for calculating a combined range-uncorrected colour value using opacity and colour values for each of the first and second pixel values; further logic means for calculating a combined range-uncorrected opacity value for a third pixel using the opacity values for each of the first and second pixel values; selection means for selecting a reciprocal range-uncorrected opacity value from a plurality of predetermined reciprocal range-uncorrected opacity values, using the combined range-uncorrected opacity value; multiplier means for multiplying the reciprocal range-uncorrected opacity value with the combined range-uncorrected colour value to determine a final range-corrected resultant colour value for the third pixel; and divider means for accepting the combined range-uncorrected opacity value and dividing the combined range-uncorrected opacity value by a predetermined integer value to determine a final range-corrected resultant opacity value for the third pixel.