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<varlistentry>
<term><option>-h</option></term>
<term><option>--help</option></term>
<listitem>
<simpara>Print a short help message describing command line
options to standard output and exit</simpara>
</listitem>
</varlistentry>
<varlistentry>
<term><option>--version</option></term>
<listitem>
<simpara>Print program version information to standard output and
exit</simpara>
</listitem>
</varlistentry>
<varlistentry>
<term><option>-v</option></term>
<term><option>--verbose<optional>=<replaceable
class="parameter">n</replaceable></optional></option></term>
<listitem>
<simpara>Increase debug output level. Multiple
<option>-v</option> options create more spew. Alternatively
specify <replaceable class="parameter">n</replaceable> to
set the debug level directly
</simpara>
</listitem>
</varlistentry>
<varlistentry>
<term><option>-S<optional><replaceable
class="parameter">symbology</replaceable>.</optional><replaceable
class="parameter">config</replaceable><optional>=<replaceable
class="parameter">value</replaceable></optional></option></term>
<term><option>--set <optional><replaceable
class="parameter">symbology</replaceable>.</optional><replaceable
class="parameter">config</replaceable><optional>=<replaceable
class="parameter">value</replaceable></optional></option></term>
<listitem>
<simpara>Set decoder configuration option <replaceable
class="parameter">config</replaceable> for <replaceable
class="parameter">symbology</replaceable> to <replaceable
class="parameter">value</replaceable>. <replaceable
class="parameter">value</replaceable> defaults to 1 if omitted.
<replaceable class="parameter">symbology</replaceable> is one of
<option>ean13</option>, <option>ean8</option>,
<option>upca</option>, <option>upce</option>,
<option>isbn13</option>, <option>isbn10</option>,
<option>i25</option>, <option>codabar</option>, <option>code39</option>,
<option>code93</option>, <option>code128</option>,
<option>qrcode</option> or the special value <option>*</option>.
If <replaceable class="parameter">symbology</replaceable> is
omitted or <option>*</option>, the <replaceable
class="parameter">config</replaceable> will be set for all
applicable symbologies. These are the currently recognized
<replaceable class="parameter">config</replaceable>s. Prefix a
config with "no-" to negate it. Not all configs are appropriate
for every symbology.</simpara>
<variablelist>
<varlistentry>
<term><option>enable</option></term>
<listitem>
<simpara>Control decoding/reporting of a symbology. For
symbologies which are just subsets of <option>ean13</option>
(<option>upca</option>, <option>upce</option>,
<option>isbn13</option>, <option>isbn10</option>), 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</simpara>
</listitem>
</varlistentry>
<varlistentry>
<term><option>disable</option></term>
<listitem>
<simpara>Antonym for <option>enable</option></simpara>
</listitem>
</varlistentry>
<varlistentry>
<term><option>emit-check</option></term>
<listitem>
<simpara>Control whether check digits are included in the
decoded output. Enabled by default. This config does not
apply for <option>code128</option>, which never returns the
check digit. It also not apply for cases where the check
digit is disabled (see <option>add-check</option>). Check
digits are currently not implemented for
<option>i25</option> or <option>code39</option></simpara>
</listitem>
</varlistentry>
<varlistentry>
<term><option>add-check</option></term>
<listitem>
<simpara>Enable decode and verification of a check digit for
symbologies where it is optional: this will include
<option>code39</option> and <option>i25</option>, neither of
which implements the check digit yet</simpara>
</listitem>
</varlistentry>
<varlistentry>
<term><option>ascii</option></term>
<listitem>
<simpara>Enable escape sequences that encode the full ASCII
character set. This would apply to <option>code39</option>,
except that it's not implemented either...</simpara>
</listitem>
</varlistentry>
<varlistentry>
<term><option>position</option></term>
<listitem>
<simpara>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.</simpara>
</listitem>
</varlistentry>
<varlistentry>
<term><option>test-inverted</option></term>
<listitem>
<simpara>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.</simpara>
</listitem>
</varlistentry>
<varlistentry>
<term><option>min-length=<replaceable class="parameter">n</replaceable></option></term>
<term><option>max-length=<replaceable class="parameter">n</replaceable></option></term>
<listitem>
<simpara>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: <option>i25</option>, <option>codabar</option>,
<option>code39</option>, <option>code128</option> and
<option>pdf417</option>. <option>min-length</option> defaults to 6
for <option>i25</option> and 1 for <option>code39</option> (per Code
39 autodiscrimination recommendation); all others default to
0</simpara>
</listitem>
</varlistentry>
<varlistentry>
<term><option>x-density=<replaceable class="parameter">n</replaceable></option></term>
<term><option>y-density=<replaceable class="parameter">n</replaceable></option></term>
<listitem>
<simpara>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.</simpara>
</listitem>
</varlistentry>
</variablelist>
</listitem>
</varlistentry>
|
