The Qing emperors were generally adept at poetry and often skilled in painting, and offered their patronage to Confucian culture. The Kangxi and Qianlong Emperors, for instance, embraced Chinese traditions both to control them and to proclaim their own legitimacy. The Kangxi Emperor sponsored the Peiwen Yunfu, a rhyme dictionary published in 1711, and the Kangxi Dictionary published in 1716, which remains to this day an authoritative reference. The Qianlong Emperor sponsored the largest collection of writings in Chinese history, the Siku Quanshu, completed in 1782. Court painters made new versions of the Song masterpiece, Zhang Zeduan's Along the River During the Qingming Festival whose depiction of a prosperous and happy realm demonstrated the beneficence of the emperor. The emperors undertook tours of the south and commissioned monumental scrolls to depict the grandeur of the occasion. Imperial patronage also encouraged the industrial production of ceramics and Chinese export porcelain.