From mboxrd@z Thu Jan 1 00:00:00 1970 Return-path: Received: from mk-outboundfilter-2.mail.uk.tiscali.com ([212.74.114.38]:4754 "EHLO mk-outboundfilter-2.mail.uk.tiscali.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751424AbZDOW1F (ORCPT ); Wed, 15 Apr 2009 18:27:05 -0400 From: Adam Baker To: Hans de Goede Subject: Re: libv4l release: 0.5.97: the whitebalance release! Date: Wed, 15 Apr 2009 23:26:59 +0100 Cc: Linux and Kernel Video , SPCA50x Linux Device Driver Development , Linux Media Mailing List References: <49E5D4DE.6090108@hhs.nl> In-Reply-To: <49E5D4DE.6090108@hhs.nl> MIME-Version: 1.0 Content-Type: Text/Plain; charset="windows-1252" Content-Transfer-Encoding: 7bit Content-Disposition: inline Message-Id: <200904152326.59464.linux@baker-net.org.uk> Sender: linux-media-owner@vger.kernel.org List-ID: On Wednesday 15 Apr 2009, Hans de Goede wrote: > Currently only whitebalancing is enabled and only on Pixarts (pac) webcams > (which benefit tremendously from this). To test this with other webcams > (after instaling this release) do: > > export LIBV4LCONTROL_CONTROLS=15 > LD_PRELOAD=/usr/lib/libv4l/v4l2convert.so v4l2ucp& > Strangely while those instructions give me a whitebalance control for the sq905 based camera I can't get it to appear for a pac207 based camera regardless of whether LIBV4LCONTROL_CONTROLS is set. > Notice the whitebalance and normalize checkboxes in v4l2ucp, > as well as low and high limits for normalize. > > Now start your favorite webcam viewing app and play around with the > 2 checkboxes. Note normalize seems to be useless in most cases. If > whitebalancing makes a *strongly noticable* difference for your webcam > please mail me info about your cam (the usb id), then I can add it to > the list of cams which will have the whitebalancing algorithm (and the v4l2 > control to enable/disable it) enabled by default. The whitebalance works really well with the sq905 (ID 2770:9120). Without it the image is very red when using artificial light, with auto whitebalance the colours look slightly desaturated but otherwise fine. Adam