"fo:external-graphic" inside a "fo:block" - Unexpected margins

[Léa Massiot <lm...@orange.fr>]

Hello and thank you for reading my post.

When I put a "fo:external-graphic" inside a "fo:block" (cf. the XSL-FO
stylesheet below and the resulting PDF document attached), I get:
- an extra (red) margin above the image,
- an extra (red) margin below the image (bigger than the previous),
- no extra left or right margins.

What are these margins?
Can they be removed?

Nota:
In the PDF file attached, the image is a GIF image.
The background of the "fo:external-graphic" element is green (rgb(0,255,0)).
The background of the "fo:block" element is red (rgb(255,0,0)).

Thank you and best regards.


XSF-FO stylesheet

<?xml version="1.0" encoding="UTF-8"?>
<xsl:stylesheet version="1.0"
xmlns:xsl="http://www.w3.org/1999/XSL/Transform"
                              xmlns:fo="http://www.w3.org/1999/XSL/Format">
                              
  <xsl:template match="quotation">
    
    <fo:root>
    
      <fo:layout-master-set>
        <fo:simple-page-master master-name = "A4-portrait" 
                               page-height="{@page_height}" 
                               page-width="{@page_width}" 
                               margin="{@margin}"                                        
                               >
                                       
          <fo:region-body background-color="orange" />
          
        </fo:simple-page-master>
      </fo:layout-master-set>

      <fo:page-sequence master-reference="A4-portrait">
        <fo:flow flow-name="xsl-region-body">
          <xsl:apply-templates select="area" />
        </fo:flow>
      </fo:page-sequence>
    </fo:root>
        
  </xsl:template>
  
  <xsl:template match="area">

      <fo:block background-color="rgb(255, 0, 0)">
      	<fo:external-graphic content-height="120%"
      	                     scaling="uniform"
      	                     background-color="rgb(0, 255, 0)"
      	                     src="url(images/try_36px_36px.gif)" />
        
        <fo:external-graphic content-height="120%"
      	                     scaling="uniform"
      	                     background-color="rgb(0, 255, 0)"
      	                     src="url(images/try_36px_36px.gif)" />
      </fo:block>
   
  </xsl:template>
</xsl:stylesheet>
http://old.nabble.com/file/p33924810/test_fo_external_graphic.pdf
test_fo_external_graphic.pdf 

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