pdf.keepPNGBoolean(default: false)
If set to true all PNG images contained in the exported file will be kept in PNG format.
Example
<div id="propertyGrid"></div>
<script>
$("#propertyGrid").kendoPropertyGrid({
    pdf: {
        fileName: "PropertyGrid.pdf",
        keepPNG: true
    },
    model: {
        foo: "bar",
        baz: 5
    }
});
</script>
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