Interactive image projection accessory

An accessory facilitating interaction with a projected image at least partially sourced by the image generation device. The accessory receives an input image from a device, and projects at least a derived image of the input image onto a surface on which the accessory sits. For instance, the accessory might project the input image itself, or perhaps some post-processed version of the input image. A camera system captures data representing user interaction with the projected image. Based on this data, an image input event is detected, and then communicated to the device. For instance, if the image generation device were a touch-sensitive device, the device may respond to the user contacting the projected image the same as it would if the user touched the image generation device at the same corresponding location. Embodiments described herein also relate color compensation of a displayed image.