1. A system for rendering an image using a light field image file including an encoded image and metadata describing the encoded image, where the metadata comprises a depth map that specifies depths from the reference viewpoint for pixels in the encoded image, the system comprising: a processor; and memory containing a rendering application and a light field image file including an encoded image and metadata describing the encoded image, where the encoded image is an image of a scene synthesized from a reference viewpoint using a plurality of lower resolution images that capture the scene from different viewpoints and the metadata comprises a depth map that specifies depths from the reference viewpoint for pixels in the encoded image, and pixels from the lower resolution images that are occluded in the reference viewpoint; wherein the rendering application configures the processor to: locate the encoded image within the light field image file; decode the encoded image; locate the metadata within the light field image file; and post process the decoded image by modifying the pixels based on the depths indicated within the depth map to create a rendered image by rendering an image from a different viewpoint using the depth map and the pixels from the lower resolution images that are occluded in the reference viewpoint.