The invention concerns painting installations comprising painting machines or robots (6a, 6b, 7a, 7b, 8a, 8b, 9a, 9b), each with a
sprayer (12) and a paint reservoir (13), associated with the
sprayer and designed to supply it, the machines or robots being arranged along a painting line for motor vehicle bodies (2). Each
machine or
robot is provided with a fluidic connector, designed to co-operate discontinuously with a dispensing
system (14a, 14b, 15a, 15b) comprising a color shade-changing unit. Each dispensing
system (14a, 14b, 15a, 15b) is arranged between two consecutive machines (6a, 7a; 6b, 7b; 8a, 9a; 8b, 9b), and is common to those two machines, which are successively connected thereto to fill their respective reservoirs each time there is a color shade change.