scaling external graphics

Dear Madam / Sir, 

I would like to use external-graphic with scaling, but as a result I get a 
picture WITH an extra black line - sometimes on the bottom, sometimes on 
the left (see output). 
I tried the following example:

<?xml version="1.0" encoding="UTF-8"?>
<fo:root xmlns:sdt="
http://www.xmlmind.com/foconverter/xsl/extensions/docx/sdt" xmlns:fo="
http://www.w3.org/1999/XSL/Format" xmlns:fox="
http://xml.apache.org/fop/extensions" xmlns:java="
http://xml.apache.org/xalan/java" xmlns:ibex="
http://www.xmlpdf.com/2003/ibex/Format" xmlns:xfc="
http://www.xmlmind.com/foconverter/xsl/extensions">
        <fo:layout-master-set>
                <fo:simple-page-master master-name="A4-first" 
page-width="210mm" page-height="297mm">
                        <fo:region-body margin-top="96mm" 
margin-bottom="40mm" margin-left="20mm" margin-right="20mm"/>
                </fo:simple-page-master>
                <fo:page-sequence-master master-name="basic">
                        <fo:repeatable-page-master-alternatives>
                                <fo:conditional-page-master-reference 
master-reference="A4-first" page-position="any"/>
                        </fo:repeatable-page-master-alternatives>
                </fo:page-sequence-master>
        </fo:layout-master-set>
        <fo:page-sequence master-reference="basic">
                <fo:flow flow-name="xsl-region-body">
                        <fo:block>
                                <fo:external-graphic height="1.5cm" 
content-height="scale-down-to-fit" src="url(images/zeem.jpg)"/>
                        </fo:block>
                        <fo:block>
                                <fo:external-graphic height="1.5cm" 
content-height="scale-down-to-fit" src="url(images/zeem3.jpg)"/>
                        </fo:block>
                </fo:flow>
        </fo:page-sequence>
</fo:root>

I would highly appreciate it if you could suggest me a solution for the 
above-mentioned problem that can be implemented by XMLMIND XFC.
Thanks in advance.

Regards, 

Dezsö Gaal

Output:



Input files:


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