Code39 doesn't scan on Paper but on PDF

Hi All,

 I am using Apache FOP and barcode4j to generate barcode.The number of
letters in my barcode is 18 and page width is 5.5cm. When I reduce the width
barcode fits into the page and barcode is still scannable from pdf.But when
its printed on paper its not printing propertly, lines are to dark and
doesnt look clear. Could you please help me if there is any workaround ?
Find below XSL template,
<xsl:param name="message" as="xs:string"/>
<xsl:param name="height" as="xs:double" select="10"/>
<xsl:param name="width" as="xs:double" select="0.15"/>

<xsl:param name="text-align" as="xs:string" select="$TEXT_ALIGN_CENTER"/>
<xsl:param name="inter-char-gap-width" as="xs:integer" select="1"/>
<xsl:param name="quiet-zone" as="xs:integer" select="10"/>
<fo:block text-align="{$text-align}" padding-top="0.2cm"
padding-left="0.5cm" padding-right="0.5cm">

    <fo:instream-foreign-object>
        <barcode:barcode xmlns:barcode="http://barcode4j.krysalis.org/ns"
                         orientation="0"
                         message="{$message}">
            <barcode:code39>
                <barcode:height>
                    <xsl:value-of select="concat($height, 'mm')" />
                </barcode:height>
                <barcode:module-width>
                    <xsl:value-of select="concat($width, 'mm')" />
                </barcode:module-width>

                <barcode:human-readable>
                    <barcode:placement>none</barcode:placement>
                </barcode:human-readable>
            </barcode:code39>
        </barcode:barcode>
    </fo:instream-foreign-object>
</fo:block>

Have tried different combinations of wide factor, interchangable gaps but
doesnt help.Using code39 is mandatory, works fine with Code128.



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