[MPlayer-dev-eng] [PATCH] New video filter: deblendlogo

[Ville Saari]

On Wed, Feb 23, 2005 at 09:21:02PM +0200, Oded Shimon wrote:

> I rewrote most of the filter, and added YUV support using the exact same 
> reverse alpha used for RGB (treating the YUV channels as RGB channels).

Note that the U and V channels are not unsigned integers like R, G, B or Y,
but signed values with bias. This makes alpha-arithmetic quite different:
you must de-bias them before multiplication.

-- 
 Ville