Patent ID: 7102651
Filing Date: 2006-09-05
Classification: G06T,G09G

Abstract:
1. A method for compositing digital graphics objects, comprising: compositing a transparency group of digital graphics objects on a group backdrop to generate an accumulated result, the transparency group including two or more contiguous digital graphics objects in a stack of digital graphics objects, the group backdrop being a result of compositing elements in the stack up to but not including the first element of the transparency group, the compositing of the transparency group including combining colors specified by the group backdrop and one or more digital graphics objects in the transparency group such that the accumulated result includes a pure backdrop contribution of the group backdrop; and removing the pure backdrop contribution of the group backdrop from the accumulated result to generate a compositing result for the transparency group, wherein the accumulated result includes an accumulated color C where bƒ is a backdrop fraction characterizing a relative contribution of the backdrop color to the accumulated color.