$ scanimage -L
device `pnm:0' is a Noname PNM file reader virtual device
device `pnm:1' is a Noname PNM file reader virtual device
$ scanimage -d epson -h
Usage: scanimage [OPTION]...

Start image acquisition on a scanner device and write PNM image data to
standard output.

-b, --batch=FORMAT         working in batch mode
    --format=pnm|tiff      file format of output file
-d, --device-name=DEVICE   use a given scanner device (e.g. hp:/dev/scanner)
-h, --help                 display this help message and exit
-L, --list-devices         show available scanner devices
-T, --test                 test backend thoroughly
-v, --verbose              give even more status messages
-V, --version              print version information
    --accept-md5-only      only accept authorization requests using md5

Options specific to device `epson':
  Scan Mode:
    --mode Binary|Gray|Color [Binary]
        Selects the scan mode (e.g., lineart,monochrome, or color).
    --halftoning None|Halftone A (Hard Tone)|Halftone B (Soft Tone)|Halftone C (Net Screen) [inactive]
        Selects the halftone.
    --dropout None|Red|Green|Blue [None]
        Selects the dropout.
    --brightness 0..0 [inactive]
        Selects the brightness.
    --sharpness -2..2 [inactive]

    --gamma-correction User defined (Gamma=1.0)|User defined (Gamma=1.8) [User defined (Gamma=1.8)]
        Selectes the gamma correction value from a list of pre-defined devices
        or the user defined table, which can be downloaded to the scanner
    --color-correction No Correction|User defined|Impact-dot printers|Thermal printers|Ink-jet printers|CRT monitors [inactive]
        Sets the color correction table for the selected output device.
    --resolution 75|150|300|600dpi [75]
        Sets the resolution of the scanned image.
    --threshold 0..255 [inactive]
        Select minimum-brightness to get a white point
  Advanced:
    --mirror[=(yes|no)] [inactive]
        Mirror the image.
    --speed[=(yes|no)] [no]

    --auto-area-segmentation[=(yes|no)] [inactive]

    --zoom 50..200 [inactive]
        Defines the zoom factor the scanner will use
    --gamma-table 0..255,...
        Gamma-correction table.  In color mode this option equally affects the
        red, green, and blue channels simultaneously (i.e., it is an intensity
        gamma table).
    --red-gamma-table 0..255,...
        Gamma-correction table for the red band.
    --green-gamma-table 0..255,...
        Gamma-correction table for the green band.
    --blue-gamma-table 0..255,...
        Gamma-correction table for the blue band.
  Color correction coefficients:
    --cct-1 -127..127 [inactive]
        Controls green level
    --cct-2 -127..127 [inactive]
        Adds to red based on green level
    --cct-3 -127..127 [inactive]
        Adds to blue based on green level
    --cct-4 -127..127 [inactive]
        Adds to green based on red level
    --cct-5 -127..127 [inactive]
        Controls red level
    --cct-6 -127..127 [inactive]
        Adds to blue based on red level
    --cct-7 -127..127 [inactive]
        Adds to green based on blue level
    --cct-8 -127..127 [inactive]
        Adds to red based on blue level
    --cct-9 -127..127 [inactive]
        Control blue level
  Preview:
    --preview[=(yes|no)] [no]
        Request a preview-quality scan.
    --preview-speed[=(yes|no)] [no]

  Geometry:
    -l 0..215.9mm [0]
        Top-left x position of scan area.
    -t 0..297.857mm [0]
        Top-left y position of scan area.
    -x 0..215.9mm [215.9]
        Width of scan-area.
    -y 0..297.857mm [297.857]
        Height of scan-area.
    --quick-format CD|A5 portrait|A5 landscape|Letter|A4|max [max]

  Optional equipment:
    --source Flatbed [inactive]
        Selects the scan source (such as a document-feeder).
    --auto-eject[=(yes|no)] [inactive]
        Eject document after scanning
    --film-type Positive Film|Negative Film [inactive]

    --bay  1 | 2 | 3 | 4 | 5 | 6  [inactive]
        select bay to scan
    --eject [inactive]


Type ``scanimage --help -d DEVICE'' to get list of all options for DEVICE.

List of available devices:
    pnm:0 pnm:1 epson:/dev/scanner/usb/0                                       