1. An image capture method comprising: capturing image data of a scene, wherein the image data is comprised of tri-stimulus device independent image data; obtaining spectral profile information for the scene; accessing a database of plural spectral profiles each of which maps a material to a corresponding spectral profile reflected therefrom; matching the spectral profile information for the scene against the database; identifying materials for objects in the scene by using matches between the spectral profile information for the scene against the database; constructing metadata which identifies materials for objects in the scene; embedding the metadata with the image data for the scene; and using the metadata to differentiate materials in the scene during post-capture rendering; and rendering the image data for the scene by using the metadata that identifies the material for objects in the scene, wherein image data having similar tri-stimulus values is rendered differently in dependence on the metadata.