The QuickCam CCD suffers from "dark current"; that is, some of the CCD
pixels will leak current under long exposures, even if they’re in the
dark, and this shows up as ugly speckling on images taken in low light.
Fortunately, the leaky pixels are the same from shot to shot. So, we
can figure out which pixels are leaky by taking some establishing shots
in the dark, and try to fix those pixels on subsequent shots. The dark
establishing shots need only be done once per camera.
This is what make.darkmask does. This program, which must be run when
the QuickCam is in darkness, figures out which pixels are leaky, and
writes a mask to /etc/qcam.darkfile which lists those pixels.
/etc/qcam.conf Configuration file /etc/qcam.darkfile Dark mask file
The QuickCam Third Party Developers web page at
Autodetection is very brittle.
Can take a long time to run.
You can have multiple Cams and multiple config files, but only one dark
The new Color QuickCam is not handled with this software, although
there are Color Cam drivers available from the web site.
Scott Laird (original code), Brian Scearce (bidirectional and dark
current modifications, xqcam window scaling, edge detection), Ed Orcutt
(autoexposure modifications), Dave Plonka (locking code). This manpage
written by Ben Pfaff <firstname.lastname@example.org> for the Debian GNU/Linux
qcam package, using information from make.darkmask.c.
Qcam 0.8 QCAM(1)