A system for determining image characteristics from an analysis area in video content, said image characteristics being used to determine one or more light effects to be rendered on one or more lighting devices (13-15) while said video content is rendered on a display device, said system comprising: at least one output interface ; and at least one processor configured to: - obtain successive video frames, - determine a first level of dynamicity in said video frames, wherein the first level of dynamicity in said video frames represents how much video frames change in successive ones of the video frames, - determine a second level of dynamicity in each of a plurality of analysis areas in said video frames, wherein the second level of dynamicity in said plurality of analysis areas in said video frames represents how much the respective analysis area change in successive ones of the video frames, - compare each of said second dynamicity levels with said first dynamicity level, - select a subset of said analysis areas based on said comparisons, - determine image characteristics from said subset of analysis areas in said video content, - determine one or more light effects based on said image characteristics, and - use said at least one output interface to control said one or more lighting device (13-15) to render said one or more light effects and/or store a light script specifying said one or more light effects. at least one output interface ; and at least one processor configured to: - obtain successive video frames, - determine a first level of dynamicity in said video frames, wherein the first level of dynamicity in said video frames represents how much video frames change in successive ones of the video frames, - determine a second level of dynamicity in each of a plurality of analysis areas in said video frames, wherein the second level of dynamicity in said plurality of analysis areas in said video frames represents how much the respective analysis area change in successive ones of the video frames, - compare each of said second dynamicity levels with said first dynamicity level, - select a subset of said analysis areas based on said comparisons, - determine image characteristics from said subset of analysis areas in said video content, - determine one or more light effects based on said image characteristics, and - use said at least one output interface to control said one or more lighting device (13-15) to render said one or more light effects and/or store a light script specifying said one or more light effects. - obtain successive video frames, - determine a first level of dynamicity in said video frames, wherein the first level of dynamicity in said video frames represents how much video frames change in successive ones of the video frames, - determine a second level of dynamicity in each of a plurality of analysis areas in said video frames, wherein the second level of dynamicity in said plurality of analysis areas in said video frames represents how much the respective analysis area change in successive ones of the video frames, - compare each of said second dynamicity levels with said first dynamicity level, - select a subset of said analysis areas based on said comparisons, - determine image characteristics from said subset of analysis areas in said video content, - determine one or more light effects based on said image characteristics, and - use said at least one output interface to control said one or more lighting device (13-15) to render said one or more light effects and/or store a light script specifying said one or more light effects. <EOS>