A method of controlling a lighting system comprising one or more luminaires for illuminating an environment. The method comprises: outputting a displayed image to a user on a screen of a user interface; allowing the user to select a region from amongst a plurality of regions in the displayed image each having a respective color; and controlling one or more of the luminaires of the lighting system to emit illumination rendering the color of the region selected by the user from the displayed image. The displayed image is determined based on the source image, the displayed image being a modification of the source image modified to account for an insusceptibility of one or more colors in the source image to be rendered through the illumination emitted by the lighting system.