public RenderedImage decodeAsRenderedImage() throws IOException {
        return decodeAsRenderedImage(0);
    }
Returns a <code>RenderedImage</code> that contains the decoded
contents of the <code>SeekableStream</code> associated
with this <code>ImageDecoder</code>.  Only
the first page of a multi-page image is decoded.
plugins/svg-plugin/batik-codec-fix/src/main/java/org/apache/batik/ext/awt/image/codec/util/ImageDecoderImpl.java