jasperreports images are always blurry

Question

A simple report with only a png in it.

Png's dpi is 96, which looks pretty sharp. However, every time i export the report, be it to .docx or to pdf, only an awfully blurry image appears.

i've tried setting

net.sf.jasperreports.image.dpi 

to 300, and to 96

both in ireports and directly on the report's jrxml as a property.

Nothing works.

exception

I've lost many days googling this matter but still no answers.

Update 1

I've been able to trace the cause of this strange behavior to itext. It seems that it has to do something with it.

Update 2

Here's the jrxml code

<?xml version="1.0" encoding="UTF-8"?>
<jasperReport xmlns="http://jasperreports.sourceforge.net/jasperreports" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://jasperreports.sourceforge.net/jasperreports http://jasperreports.sourceforge.net/xsd/jasperreport.xsd" name="carta_policia" pageWidth="612" pageHeight="792" columnWidth="572" leftMargin="20" rightMargin="20" topMargin="20" bottomMargin="20" uuid="fbda9a68-7549-438c-a8ad-b3aedaf0b2d4">
    <property name="ireport.zoom" value="1.0"/>
    <property name="ireport.x" value="0"/>
    <property name="ireport.y" value="0"/>
    <property name="ireport.background.image" value="C:\Users\thou\workspace\cujillo\WebContent\resources\reports\fondo.png"/>
    <property name="ireport.background.image.properties" value="false,true,0.25,0,0,0,0,0,0"/>
    <property name="net.sf.jasperreports.image.dpi" value="96"/>
    <parameter name="SUBREPORT_DIR" class="java.lang.String" isForPrompting="false">
        <defaultValueExpression><![CDATA["C:/Users/thou/workspace/cujillo/WebContent/resources/reports/"]]></defaultValueExpression>
    </parameter>
    <parameter name="R_RADICADO" class="java.lang.String"/>
    <parameter name="SUBREPORT_DATA_SOURCE" class="net.sf.jasperreports.engine.JRDataSource"/>
    <parameter name="R_ASUNTO" class="java.lang.String"/>
    <parameter name="R_LOCALIDAD" class="java.lang.String"/>
    <parameter name="R_IMAGE_RENDERER" class="net.sf.jasperreports.engine.JRRenderable" isForPrompting="false"/>
    <parameter name="R_PRINT_BACKGROUND" class="java.lang.String"/>
    <background>
        <band height="752"/>
    </background>
    <title>
        <band height="371" splitType="Stretch">
            <image scaleImage="RealSize">
                <reportElement uuid="dbadb500-4011-415b-bd98-4236532783c4" x="234" y="147" width="75" height="63"/>
                <imageExpression><![CDATA["C:\\Users\\thou\\workspace\\cujillo\\WebContent\\resources\\reports\\alcaldia mayor.png"]]></imageExpression>
            </image>
            <image scaleImage="Clip">
                <reportElement uuid="ecf7dbe3-4369-41a8-ba49-db98ba5ef478" x="309" y="151" width="75" height="63"/>
                <imageExpression><![CDATA["C:\\Users\\thou\\workspace\\cujillo\\WebContent\\resources\\reports\\alcaldia mayor.jpg"]]></imageExpression>
            </image>
        </band>
    </title>
    <pageHeader>
        <band splitType="Stretch"/>
    </pageHeader>
    <columnHeader>
        <band splitType="Stretch"/>
    </columnHeader>
    <detail>
        <band height="104" splitType="Stretch"/>
    </detail>
    <columnFooter>
        <band splitType="Stretch"/>
    </columnFooter>
    <pageFooter>
        <band height="11" splitType="Stretch"/>
    </pageFooter>
    <summary>
        <band height="209" splitType="Stretch"/>
    </summary>
</jasperReport>

Answer 1

Although we've raised the DPI setting in our presentations, I've implemented a custom exporter, which exports charts as powerpoint shapes and not as raster images. At least for .docx it's feasible to implement something similar.

Before I've started the shape export classes, I've tried to use EMF (1,2) as an image format, but this is quite limited, e.g. it doesn't embed fonts.

I haven't searched further in the direction, but maybe you can transform an intermediate SVG image to something (raster/vector) which can be embedded into .docx/.pdf.

Have you checked the images inside .docx-Zip-file? ... are the plain images also blurry or just when they are displayed by Word/LibreOffice. And of course the images should change after you changed the DPI setting - if not, try to put a jasperreports.properties in the classpath