For each specified
scans the image for bar codes and prints any decoded data to stdout. Images may optionally be displayed to the screen.
The underlying library currently supports EAN-13 (including UPC and ISBN subsets), EAN-8, DataBar, DataBar Expanded, Code 128, Code 93, Code 39, Codabar, Interleaved 2 of 5 and QR Code symbologies. The specific type of each detected symbol is printed with the decoded data.
Note that "image" in this context refers to any format supported by ImageMagick, including many vector formats such as PDF and PostScript. Keep in mind that vector formats are rasterized before scanning; manually rasterize vector images before scanning to avoid unintentionally corrupting embedded barcode bitmaps.
This program follows the usual GNU command line syntax. Single letter options may be bundled, long options start with two dashes (`-').
Print a short help message describing command line options to standard output and exit
Print program version information to standard output and exit
Increase debug output level. Multiple
options create more spew. Alternatively specify
to set the debug level directly
-S[symbology.]config[=value], --set [symbology.]config[=value]
Set decoder configuration option
defaults to 1 if omitted.
is one of
or the special value
is omitted or
will be set for all applicable symbologies. These are the currently recognized
configs. Prefix a config with "no-" to negate it. Not all configs are appropriate for every symbology.
Control decoding/reporting of a symbology. For symbologies which are just subsets of
isbn10), this config controls whether the subsets are detected and reported as such. These special cases are disabled by default, all other symbologies default to enabled
Control whether check digits are included in the decoded output. Enabled by default. This config does not apply for
code128, which never returns the check digit. It also not apply for cases where the check digit is disabled (see
add-check). Check digits are currently not implemented for
Enable decode and verification of a check digit for symbologies where it is optional: this will include
i25, neither of which implements the check digit yet
Enable escape sequences that encode the full ASCII character set. This would apply to
code39, except that it's not implemented either...
Enable collection of symbol position information. Enabled by default. Currently, the position information is unusable, so you can save a few cycles by disabling this.
Specially for QR code images, sometimes the image is inverted, e. g. lines are written in white instead of black. This option makes ZBar to invert the image and parse again, in case it fails using the normal order. Enabling it affects all decoders.
Bound the number of decoded characters in a valid symbol. If a decode result is outside the configured min/max range (inclusive), it will not be reported. Set to 0 to disable the corresponding check. This setting applies to variable-length symbologies:
defaults to 6 for
and 1 for
(per Code 39 autodiscrimination recommendation); all others default to 0
Adjust the density of the scanner passes. Lower values scan more of the image at the cost of decreased performance. Setting to 0 disables scanning along that axis. Defaults are both 1.
Quiet operation; only output decoded symbol data. specifically this disables the statistics line printed (to stderr) before exiting, as well as the warning message printed (also to stderr) when no barcodes are found in an image
-d, --display, -D, --nodisplay
Enable/disable display of subsequent
files, until next
is encountered. This option may appear multiple times to enable display of specific images. Image display is disabled by default
Enable/disable result output using an XML format. This format wraps the raw data from the symbol with information about the scan (such as page indices) in an easy to parse format. The latest schema is available from
Enable raw symbol data output. This format prints symbol data separated by newlines without the additional symbology type information that is printed by default
Scan a PNG image of a UPC bar code symbol and pass resulting data to a script that searches for the code in a database and does something useful with it:
zbarimg product.png | upcrpc.py
example script included in the
subdirectory of the distribution will make an XMLRPC call to a popular internet UPC database and print the product description if found.
Scan a JPEG image containing several barcodes and display the image in a window, also disabling recognition of Interleaved 2 of 5 codes to prevent confusion with other symbologies or background noise:
zbarimg --display -Si25.disable label.jpg
Look in a scanned document only for Code 39, using XML output format so the page numbers are available. To enable only Code 39, first all symbologies are disabled, then Code 39 is re-enabled:
zbarimg --xml -Sdisable -Scode39.enable scan.tiff
returns an exit code to indicate the status of the program execution. Current exit codes are:
Barcodes successfully detected in all images. Warnings may have been generated, but no errors.
An error occurred while processing some image(s). This includes bad arguments, I/O errors and image handling errors from ImageMagick.
ImageMagick fatal error.
The user quit the program before all images were scanned. Only applies when running in interactive mode (with
No barcode was detected in one or more of the images. No other errors occurred.
Jeff Brown <email@example.com>
Copyright © 2007-2010 Jeff Brown
All Rights Reserved