Green’s Dictionary of Slang

(orig. US) pictures, whether still or motion.

1932		Variety 19 July 4/5: [heading] ‘Million’, Par’s all-star pix.
1941		L. Rosten Hollywood 47: Pix is shorthand for pictures.
1957		G. Kersh Fowlers End (2001) 1: That’s right, ad. Not advertisement. Ad. Like Biz, like Pix, like Lites.
1962		S. Longstreet Flesh Peddlers (1964) 40: A remake of Little Women [...] has been finalized by Booley Cohen as the next pix for Nemu Hecht.
1970		T. Southern Blue Movie (1974) 10: Les Harrison — handsome, forty-three-year-old vice-prez of Metropolitan pix.
1990		(con. early 1950s) J. Ellroy L.A. Confidential 99: Bobby would snitch his co-stars and the guys who took the pix.
2001		K. Waterhouse Soho 113: Supplying him with kinky pix, that would be it.