---
name: "sane-leo"
section: "5"
platform: "linux"
package: "sane"
version: "1.4.0-4"
release: "Arch Linux 2026-11-01"
platforms: ["linux"]
url: "https://new.carta.tech/sane-leo"
---

# sane-leo(5)

SANE backend for LEO Technologies scanners

## NAME

sane-leo - SANE backend for LEO Technologies scanners

## DESCRIPTION

The **sane-leo** library implements a SANE (Scanner Access Now Easy) backend that provides access to some LEO SCSI flatbed scanners. This backend should be considered **beta-quality** software! LEO scanners were also sold under the Across Technologies brand.

The scanners that should work with this backend are:

```
   Vendor Model           status
----------------------  -----------
  Across FS-1130          tested
  LEO S3                  tested
```

The options the backend supports can either be selected through command line options to programs like [**scanimage**(1)](/scanimage/1.md) or through GUI elements in [**xscanimage**(1)](/xscanimage/1.md) or [**xsane**(1)](/xsane/1.md).

If you have any strange behavior, please report to the backend maintainer or to the SANE mailing list.

Valid command line options and their syntax can be listed by using

scanimage --help -d leo

- **Scan Mode**

  - **--mode**

  selects the basic mode of operation of the scanner. Valid choices are *Black & White*, *Grayscale* and *Color*. The *Black & White* mode is black and white only (1 bit). *Grayscale* mode will produce 256 levels of gray (8 bits). *Color* mode will produce a 24 bit color image.

- **--resolution**

  selects the resolution for a scan. The scanner can do all resolutions between 1 and 300, in increments of 1.

- **Geometry options**

  - **-l -t -x -y**

  control the scan area: -l sets the top left x coordinate, -t the top left y coordinate, -x selects the width and -y the height of the scan area. All parameters are specified in millimeters by default.

- **Enhancement options**

  - **--custom-gamma**

  (grayscale and color mode only) allows the user to specify a gamma table (see the next 3 parameters).

- **--red-gamma-table**

  (color mode only) can be used to download a user defined gamma table for the red channel. The table must be 256 bytes long.

- **--green-gamma-table**

  (color mode only) can be used to download a user defined gamma table for the green channel. The table must be 256 bytes long.

- **--blue-gamma-table**

  (color mode only) can be used to download a user defined gamma table for the blue channel. The table must be 256 bytes long.

- **--halftone**

  (Black & White only) select the halftone mask to use. Possible values are *Diamond*, *8x8 Coarse Fatting*, *8x8 Fine Fatting*, *8x8 Bayer* and *8x8 Vertical Line*.

- **--preview**

  requests a preview scan. The resolution used for that scan is 28 dpi and the scan area is the maximum allowed. The scan mode is user selected. The default is "no".

## CONFIGURATION FILE

The configuration file */etc/sane.d/leo.conf* supports only one information: the device name to use (eg */dev/scanner*).

## FILES

- */usr/lib/sane/libsane-leo.a*

  The static library implementing this backend.

- */usr/lib/sane/libsane-leo.so*

  The shared library implementing this backend (present on systems that support dynamic loading).

## ENVIRONMENT

- **SANE\_DEBUG\_LEO**

  If the library was compiled with debug support enabled, this environment variable controls the debug level for this backend. E.g., a value of 128 requests all debug output to be printed. Smaller levels reduce verbosity.

## LIMITATIONS

The windows TWAIN driver has many more options than this SANE backend. However they are only software adjustments. This backend only implements what the scanner can support.

## BUGS

None known.

## SEE ALSO

[**sane-scsi**(5)](/sane-scsi/5.md), [**scanimage**(1)](/scanimage/1.md), [**xscanimage**(1)](/xscanimage/1.md), [**xsane**(1)](/xsane/1.md), [**sane**(7)](/sane/7.md)

## AUTHOR

- The package is actively maintained by Frank Zago.

  *http://www.zago.net/sane/#leo*