1. A method of representing an object appearing in an image, the method comprising deriving a plurality of view descriptors of the object, each view descriptor corresponding to a different view of the object, the method comprising indicating for each view descriptor when the respective view corresponds to a view of the object appearing in the image, wherein at least one view descriptor comprises a representation of the colour of the object in the respective view, wherein each view is a view of the object from a respective angle of view, the plurality of view descriptors including at least one descriptor of the view of the object in the image and at least one descriptor of a view of the object from an angle of view different from the angle of view of the object in the image.