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On Tue, May 13, 2003 at 11:31:17AM -0500, Peter Chen wrote: > Hi, >=20 > I still do not quite understand. When I tried to scan the same image using > Twain, there was no gray background. What could be the reason? >=20 > And I could not find the option to set the option brightness/contrast whe= n I > ran: scanimage --help -d fujitsu:/dev/usb/scanner0. Perhaps you need to do some calibration? The HP5400 scanner has a white strip inside the scanner which you scan first. That gives the white level for each colour and pixel. That's then used to fix up the rest of the image. --=20 Martijn van Oosterhout <klep...@svana.org> http://svana.org/kleptog/ > "the West won the world not by the superiority of its ideas or values or > religion but rather by its superiority in applying organized violence. > Westerners often forget this fact, non-Westerners never do." > - Samuel P. Huntington --mYCpIKhGyMATD0i+ Content-Type: application/pgp-signature Content-Disposition: inline -----BEGIN PGP SIGNATURE----- Version: GnuPG v1.0.6 (GNU/Linux) Comment: For info see http://www.gnupg.org iD8DBQE+wYh5Y5Twig3Ge+YRAs5eAKCFd7ZxyT+HPN6yixzngTyjjntAowCfQP48 3ex7ceiU1/QBljd0vT538JA= =M81q -----END PGP SIGNATURE----- --mYCpIKhGyMATD0i+--
