Terminal.setBackgroundTintColor

If a background image has been set using vte_terminal_set_background_image(), vte_terminal_set_background_image_file(), or vte_terminal_set_background_transparent(), and the value set by vte_terminal_set_background_saturation() is less than one, the terminal will adjust the color of the image before drawing the image. To do so, the terminal will create a copy of the background image (or snapshot of the root window) and modify its pixel values. The initial tint color is black.