Compositing in the presence of different transpare

专利名称：Compositing in the presence of different

transparencies

发明人：Mark Hamburg申请号：US11405949申请日：20060417公开号：US07184055B2公开日：20070227

专利附图：

摘要：Methods and apparatus, including computer program products, for blending inthe presence of different transparencies. In one aspect, the invention provides acomputer implemented method for blending a first graphic element and a second

graphic element in accordance with a transfer mode T, the first graphic element having acolor A and an alpha a, the second graphic element having a color B and an alpha b. Themethod includes: calculating a resulting alpha as lerp(a, b, q), lerp being a linearinterpolation function and q being a pseudo-opacity that varies between 1 and 0,inclusive; calculating a blended color as T(A, B, q); calculating an intermediate color asinterpolate_color(A, blended color, min(b/resulting alpha, 1)), interpolate_color being acontinuous function that interpolates its input colors and min being a function thatselects the smaller of its input values; and calculating a result color asinterpolate_color(B, intermediate color, min(a/resulting alpha, 1)).

申请人：Mark Hamburg

地址：Scotts Valley CA US

国籍：US

代理机构：Fish & Richardson P.C.

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