QTextBrowser toPlainText() output contains HEX chars in place of images

#include <QFile>
#include <QApplication>
#include <QTextBrowser>
#include <QTextStream>

int main(int argc, char *argv[])
{
    QApplication a(argc, argv);
    QTextBrowser *textBrowser = new QTextBrowser();
    textBrowser->setGeometry(QRect(50, 50, 531, 521));
    textBrowser->setSource(QUrl("qrc:/testHtml.html"));

    QFile f("output.txt");
    if(f.open(QIODevice::WriteOnly)) {
        QTextStream out(&f);
        out << textBrowser->toPlainText();
    }
    textBrowser->show();
    return a.exec();
}