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sane-umax-doc.htmlIndex Frontend options:
sane-umax-standard-options-doc.htmlStandard options sane-umax-advanced-options-doc.htmlAdvanced options Supported scanners:
sane-umax-powerlook-doc.htmlPower Look series sane-umax-mirage-doc.htmlMirage series sane-umax-astra-doc.htmlAstra series sane-umax-vista-doc.htmlVista series sane-umax-uc-doc.htmlUC series sane-umax-others-doc.htmlothers sane-umax-not-listed-doc.htmlNot listed scanners sane-umax-scanner-clones-doc.htmlUMAX scanner clones sane-umax-parport-doc.htmlUMAX parallel port scanners sane-umax-config-doc.htmlConfiguration sane-umax-speed-doc.htmlSpeed of UMAX scanners http://www.rauch-domain.de/sane-umaxSANE-umax homepage http://sane-project.orgSANE homepage http://www.xsane.org/XSane homepage               
This backend dynamically enabeles the options that are supported
by the scanner in dependence of the scanning-mode and other options. Here
is an example of the frontend
http://www.xsane.orgXSane :
main-windowThe options Gamma, brightness, contrast and negative in the
main window come from xsane that calculates a gamma table using this values.
These values are corelated to highlight, midlight and shadow sliders in
the Histogram window.
Scan modes:
Mode Remark Lineart 1 bit/pixel black/white mode Halftone 1 bit/pixel dithered black/white mode Grayscale 8 / 9 / 10 / 12 / 14 / 16 bits/pixel gray mode Color 24 / 27 / 30 / 36 / 42 / 48 bits/pixel RGB mode Scan sources:
Scan sources Flatbed Transparency adapter (UTA) Automatic document feeder (ADF) Standard options:
sane-umax-standard-options-screenshot Standard options Remark Analog gamma correction Define the value for analog gamma correction. *
Value between 1.0 and 2.0 .
(Analog gamma correction doesn't reduce the number of used colors) Highlight Define the intensity that shall be considered white. * Shadow Define the intensity that shall be considered black. * Contrast Define the contrast of the image - only available in halftone-mode. Brightness Define the brightness of the image - only available in halftone-mode. Threshold Define the minimum intensity to get a white point- only available in
lineart-mode.
Use custom gamma table Use free definable scanner internal digital gamma table.
If you enable this option, the gamma correction is done inside the
scanner. If you have a scanner with more than 8/24 bits/pixel, the image
is scanned with the maximum available bit depth. The gamma correction does
transform the image form the internal bit depth to the selected output
bit depth (see below).
The frontends do handle the usage of the gamma table different. If
you use xsane, you should enable this option to use the maximum available
bit depth (otherwise xsane does the conversion with the selected output
bit depth).
(Side-effect: digital gamma correction may reduce the number of used
colors -especally if the used bit depth is low.)
Quality calibration Use quality white calibration. * Double optical resolution Use lens 2 on high end scanners, this reduces the scanwidth and increases
the maximum scanresolution. *
Negative scan Inverts color intensity - for scanning negatives. Bit depth Image depth in bits/sample the scanner sends to the computer, normally
8 in grayscale and color mode. Some scanners support more than 8bits/sample,
but only few file formats support it. If your scanner supports more than
8bis/sample you already get an improvement if you set the bit detpth to
8 and enable the option 
use custom gamma table (see above) because
the scanner internal gamma correction is done with the maximum available
bit depth!!!
*** There is normally no reason to use more than 8 bits/sample! *** Lamp warmup Enable extended lamp-warmup. * * only available for some scanners Author: 
mailto:Oliver.Rauch@rauch-domain.deOliver Rauch 