The Colour of Magic: The Illustrated Screenplay

From Author Wars - https://authorwars.com/publications/the-colour-of-magic-the-illustrated-screenplay-249942.html

Overview:

Title: The Colour of Magic: The Illustrated Screenplay
Author: Terry Pratchett
Year: 2008
ISBN-10: 9780575080454
Publisher: Gollancz
Price: £20.00
Pages: 196
Binding: Hardcover
Type: Novel
Title Reference: The Colour of Magic: The Illustrated Screenplay
Notes: Amazon UK (as of 2008-03-04) has a subtitle: 'The Illustrated Screenplay', price and format: £20.00, hardcover.
Foyles has additional info: 'illustrated throughout with stills, production drawings, character sketches, and anything else the film boys left lying around!'
Also the websites state Vadim Jean as coauthor.