Patent ID: 7864197
Filing Date: 2011-01-04
Classification: G06T

Abstract:
1. A computer-implemented method of representing an amount of image color in a composite image, said method comprising the steps of: generating at least one additional opacity channel for use in creating the composite image, the additional opacity channel initially set to fully opaque to represent that all of the image color is visible; compositing at least one partially transparent graphical object having object color and object opacity, with an image having image opacity and the image color, to create the composite image, the composite image having composite image color and composite image opacity, the composite image color and composite image opacity being derived from one or more of the object color, the object opacity, the image color and the image opacity; compositing the object opacity with the additional opacity channel to update the additional opacity channel, the updated additional opacity channel thereby being less than fully opaque and representing an amount of the image color remaining in the composite image following the compositing of the at least one graphical object with the image; and storing at least the updated additional opacity channel in a computer-readable memory, wherein the steps are performed on a processor.