From mboxrd@z Thu Jan 1 00:00:00 1970 Return-path: Received: from shell.devel.redhat.com (shell.devel.redhat.com [10.10.36.195]) by int-mx1.corp.redhat.com (8.13.1/8.13.1) with ESMTP id mBOJuu0Z013970 for ; Wed, 24 Dec 2008 14:56:56 -0500 Received: from shell.devel.redhat.com (localhost.localdomain [127.0.0.1]) by shell.devel.redhat.com (8.13.8/8.13.8) with ESMTP id mBOJuuSd013210 for ; Wed, 24 Dec 2008 14:56:56 -0500 Received: (from alan@localhost) by shell.devel.redhat.com (8.13.8/8.13.8/Submit) id mBOJuua6013209 for video4linux-list@redhat.com; Wed, 24 Dec 2008 14:56:56 -0500 Date: Wed, 24 Dec 2008 14:56:56 -0500 From: Alan Cox To: video4linux-list Mailing List Message-ID: <20081224195656.GA12626@shell.devel.redhat.com> References: <20081224140706.GA475@geppetto> Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20081224140706.GA475@geppetto> Subject: Re: V4L1: what's the meaning of video_window.chromakey? List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Sender: video4linux-list-bounces@redhat.com Errors-To: video4linux-list-bounces@redhat.com List-ID: On Wed, Dec 24, 2008 at 03:07:06PM +0100, Stefano Sabatini wrote: > My guess is that V4L is using the simplest possible chromakeying > algorithm, so that it copies each pixel from the capture buffer to > the destination buffer with a value different from > video_window.chromakey. Chroma key is supported just for hardware that does it. Mostly old ISA hardware could do chromakey overlay but nothing else. I think the PMS is the only card with V4L1 one support that ever had chromakey in a production kernel. Its also analogue side chromakey so "kind of the same shade as" rather than 24bit match. Alan -- video4linux-list mailing list Unsubscribe mailto:video4linux-list-request@redhat.com?subject=unsubscribe https://www.redhat.com/mailman/listinfo/video4linux-list