1. A method comprising: obtaining foreground video data; obtaining background video data; determining a color-distribution dimensionality of the background video data to be either high-dimensional chromatic or low-dimensional chromatic; selecting a chromatic-adjustment technique from a set of chromatic-adjustment techniques based on the determined color-distribution dimensionality of the background video data; adjusting the foreground video data using the selected chromatic-adjustment technique; generating combined video data at least in part by combining the background video data with the adjusted foreground video data; and outputting the combined video data for display.