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Langue: en

Version: 314424 (ubuntu - 07/07/09)

Section: 1 (Commandes utilisateur)






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.
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-+- Paul Valéry -+-