From mboxrd@z Thu Jan 1 00:00:00 1970 Return-path: Received: from rv-out-0506.google.com ([209.85.198.229]:11880 "EHLO rv-out-0506.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751870AbZA2CYK (ORCPT ); Wed, 28 Jan 2009 21:24:10 -0500 Received: by rv-out-0506.google.com with SMTP id k40so7259134rvb.1 for ; Wed, 28 Jan 2009 18:24:09 -0800 (PST) MIME-Version: 1.0 Date: Thu, 29 Jan 2009 11:24:09 +0900 Message-ID: <5e9665e10901281824ibccbf00lcbecba5b01fdcbea@mail.gmail.com> Subject: [V4L2] EV control API for digital camera From: DongSoo Kim To: linux-media@vger.kernel.org, video4linux-list@redhat.com Cc: =?EUC-KR?B?x/zB2CCx6A==?= , jongse.won@samsung.com, kyungmin.park@samsung.com Content-Type: text/plain; charset=ISO-8859-1 Content-Transfer-Encoding: 7bit Sender: linux-media-owner@vger.kernel.org List-ID: Hello. When we take pictures, sometimes we don't get satisfied with the exposure of picture. Too dark or too bright. For that reason, we need to bias EV which represents Exposure Value. So..if I want to control digital camera module with V4L2 API, which API should I take for EV control? V4L2 document says that V4L2_CID_BRIGHTNESS is for picture brightness, but it is for "Image properties" and that "image" means the image frame of TV or PVR things.Am I right? If I may, can I use V4L2_CID_BRIGHTNESS for EV control of digital cameras? or..otherwise I should make a new API for that functionality. I'm little bit confused, because I think the brightness of picture could differ from exposure value of digital camera..help me ;( Regards. Nate -- ======================================================== Dong Soo, Kim Engineer Mobile S/W Platform Lab. S/W centre Telecommunication R&D Centre Samsung Electronics CO., LTD. e-mail : dongsoo.kim@gmail.com dongsoo45.kim@samsung.com ========================================================