The Russo-Japanese War was covered by dozens of foreign journalists who sent back sketches that were turned into lithographs and other reproducible forms. Propaganda images were circulated by both sides, often in the form of postcards and based on insulting racial stereotypes. These were produced not only by the combatants but by those from European countries who supported one or the other side or had a commercial or colonial stake in the area. War photographs were also popular, appearing in both the press and in book form.