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       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
       mask file.

       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 <> for the Debian GNU/Linux
       qcam package, using information from make.darkmask.c.

                                   Qcam 0.8                            QCAM(1)