The agency, which replaced Golin Harris on the account at the end of January, declined to comment on the reasons for its sudden departure.
But C&W corporate MD Stephen Doherty said his firm would not be taking part in the subsequent pitch Getty Images is now preparing.
Getty Images PR director Alison Crombie said talks with agencies were at a 'very early stage', adding that she hoped to draw up a shortlist in the new year.
Cohn & Wolfe replaced Golin Harris on the Getty Images account following a five-way pitch in January (PRWeek 14 January).
The brief to raise Getty Images' profile with the UK broadsheets as well as film and photography titles involves the promotion of the company to potential customers, such as PROs and advertising companies, and the promotion of Getty Images' picture gallery.
Getty Images sells royalty and rights-managed pictures through its search and download website.