Q: If some one is in the business of selling books. Can he sell books with pictures? Can he supply printing papers to publisher knowing fully well it is used for printing books with pictures? Can he supply raw materials of any kind which goes to print such books with full knowledge?
A: He should try his best to avoid this.
The publisher will use the paper for all types of reasons, for reasons that are permissible and reasons that are not permissible. Most of the time it will be mainly for permissible reasons and partly for impermissible reasons. Hence, it is is permissible to sell it.
And Allah Ta’ala (الله تعالى) knows best.