Ohara Institute for Social Research, Hosei University. They own a collection of 2700 posters of pre-1945 period and 1400 posters of post-1945 period. Images of Japanese Labor and Social Movement in pre-1945 Japan are examples of what is included in the collection. The site is in English and Japanese.https://oisr-org.ws.hosei.ac.jp/english/public/
East Asian Library, Robarts Library at U of T subscribes to the Kikuzo II Visual for Libraries (Asahi newspaper online). This database has the Asahi Shinbun Rekishi Shashin Akaibu (Asahi Newspaper Historical photographs archive). It is in Japanese. You can browse for photographs by category. As an example, here is a link to colonial rule in Manchuria. The permanent link to this resource is http://go.utlib.ca/cat/7911786
China 1917-1932, Duke University Digital Collections Primarily images from China but some also from Japan, Russian, Korea.
Korean Collection University of Washington, D.C.
Small Collection of Prints on life in China, Hamilton Library, University of Hawaii.