From mboxrd@z Thu Jan 1 00:00:00 1970 Return-path: Received: from smtp3-g21.free.fr ([212.27.42.3]:39627 "EHLO smtp3-g21.free.fr" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1754731Ab0AZSft convert rfc822-to-8bit (ORCPT ); Tue, 26 Jan 2010 13:35:49 -0500 Received: from smtp3-g21.free.fr (localhost [127.0.0.1]) by smtp3-g21.free.fr (Postfix) with ESMTP id 2633681808C for ; Tue, 26 Jan 2010 19:35:43 +0100 (CET) Received: from tele (qrm29-1-82-245-201-222.fbx.proxad.net [82.245.201.222]) by smtp3-g21.free.fr (Postfix) with ESMTP id F0964818245 for ; Tue, 26 Jan 2010 19:35:40 +0100 (CET) Date: Tue, 26 Jan 2010 19:37:26 +0100 From: Jean-Francois Moine To: Linux Media Mailing List Subject: Re: Setting up the exposure time of a webcam Message-ID: <20100126193726.00bcbc00@tele> In-Reply-To: <20100126170053.GA5995@pathfinder.pcs.usp.br> References: <20100126170053.GA5995@pathfinder.pcs.usp.br> Mime-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8BIT Sender: linux-media-owner@vger.kernel.org List-ID: On Tue, 26 Jan 2010 15:00:53 -0200 Nicolau Werneck wrote: > Hello. I have this very cheap webcam that I sent a patch to support on > gspca the other day. The specific driver is the t613. > > I changed the lens of this camera, and now my images are all too > bright, what I believe is due to the much larger aperture of this new > lens. So I would like to try setting up a smaller exposure time on the > camera (I would like to do that for other reasons too). > > The problem is there's no "exposure" option to be set when I call > programs such as v4lctl. Does that mean there is definitely no way for > me to control the exposure time? The hardware itself was not designed > to allow me do that? Or is there still a chance I can create some C > program that might do it, for example? [snip] Hello Nicolau, There are brightness, contrast, colors, autogain and some other video controls for the t613 webcams. You must use a v4l2 compliant program to change them, as vlc or v4l2ucp (but not cheese). Regards. -- Ken ar c'hentañ | ** Breizh ha Linux atav! ** Jef | http://moinejf.free.fr/