diff options
Diffstat (limited to 'doc/sane-genesys.man')
| -rw-r--r-- | doc/sane-genesys.man | 22 |
1 files changed, 14 insertions, 8 deletions
diff --git a/doc/sane-genesys.man b/doc/sane-genesys.man index 0cd1ffb..2b96483 100644 --- a/doc/sane-genesys.man +++ b/doc/sane-genesys.man @@ -48,11 +48,17 @@ GL841, GL843, GL847 or GL124 chipset, you can try to add it to the backend. .SH "CALIBRATION" To give correct image quality, sheet fed scanners need to be calibrated using the calibration sheet sold with the scanner. To do calibration, you must insert this target -in the feeder then start calibration either by passing the --calibrate option to scanimage +in the feeder then start calibration either by passing the \-\-calibrate option to scanimage or by clicking on the available 'calibrate' button in the 'advanced options' in a graphical frontend. The result of the calibration is stored in a file in the home directory of the user doing it. If you plug the scanner in another machine or use it with another account, calibration -will have to be redone. +will have to be redone, unles you use the \-\-calibration\-file option. +If no home directory is defined, +USERAPPPROFILE will be used, then TMPDIR or TMP. If none of these directories exist, the backend will try +to write in the current working directory. Flatbed scanners alos make use of the calibration file as a cache +to avoid calibration before each scan. Calibration file name is the name of the scanner model if only +one scanner is detected. In the case of several identical model, the file name will be the name +of the logical USB device name. .SH EXTRAS SCAN OPTIONS @@ -69,13 +75,13 @@ whith brightness below that value will be scanned as black. .B \-\-brightness value .RS - -100..100 (in steps of 1). Set the brightness enhancement. 0 for no enhancement, negative + \-100..100 (in steps of 1). Set the brightness enhancement. 0 for no enhancement, negative values to decrease brigthness, and positive values to increase it. .RE .B \-\-contrast value .RS - -100..100 (in steps of 1). Set the contrast enhancement. 0 for no enhancement, negative + \-100..100 (in steps of 1). Set the contrast enhancement. 0 for no enhancement, negative values to decrease contrast, and positive values to increase it. .RE @@ -112,9 +118,9 @@ next scan will happen. .B \-\-calibration\-file .RS Specify the calibration file name to use. At least the directory containing the file -must exist, since it won't be created. This allow to handle the case of several identical devices -that would otherwise use the same calibration data. This option is disabled if the backend is ran -as root. +must exist, since it won't be created. This option is disabled if the backend is ran +as root. It maybe used in case of sheet-fed scanners to share a calibration file for several +users. .RE .PP @@ -295,7 +301,7 @@ Alexey Osipov <simba@lerlan.ru> for HP2400 final support Powersaving isn't implemented for gl646 based scanner. Dynamic (emulated from gray data and with dithering) isn't enabled for gl646 scanners. Hardware lineart is limited up to 600 dpi for gl847 based scanners, due to the way image sensors are built. .br .TP -This backend will be much slower if not using libusb-1.0. So be sure that sane-backends is built with the --enable-libusb_1_0 option. +This backend will be much slower if not using libusb\-1.0. So be sure that sane\-backends is built with the \-\-enable-libusb_1_0 option. .br .SH "BUGS" |