Mammootty and Mohanlal were the “brand ambassadors” of Malayalam cinema, even now. It was an era when only one theatre in Chennai would screen Malayalam movies.
Priyadarshan’s Chithram (1988) was one of those films that ran in all of Tamil Nadu to full shows and increased the number of screens for a Malayalam movie from one to many.
While we are talking about films in colour, we also have to remember the effect Kamal Hassan had in the transition era of Black-and-White to colour in Malayalam.