Red Hat Bugzilla – Bug 474665
very dark output from Logitech QuickCam Chat webcam
Last modified: 2008-12-09 03:37:14 EST
Created attachment 325734 [details]
full dmesg output
Description of problem:
Logitech QuickCam gives very dark image/video.
Version-Release number of selected component (if applicable):
The HW (lsusb excerpt) is:
Bus 007 Device 002: ID 046d:092e Logitech, Inc. QuickCam Chat
The kernel is:
uname -a: Linux erazim.local.lab.devnull.cz 220.127.116.11-117.fc10.i686 #1 SMP Tue Nov 18 12:19:59 EST 2008 i686 athlon i386 GNU/Linux
launch cheese and watch the image.
the image/video is too dark.
the image/video should be usable.
dmesg output is attached.
Created attachment 325736 [details]
camera output taken by cheese
and no, I am not sitting in a dark room :)
(In reply to comment #1)
> and no, I am not sitting in a dark room :)
Well you are, but that is all relative. Atleast you are not sitting in a room in daylight on a bright sunny day. Artificial light is much darker then daylight, but the human eye is very good in compensating for this (unlike webcams).
The problem is that you're cam does not have autoexposure support in the driver and thus will not automatically adjust to lightning conditions.
You can however control the exposure setting manual to fix the image. Install v4l2ucp (as root do: "yum install v4l2ucp") and then run v4l2ucp.
This will give you an exposure slider, upping the exposure setting should fix your issue (at the cost of framerate, so the image might get a bit jerky).
I'm planning on adding software autoexposure code to libv4l sometime in the future.