1. A method for blurring a light-field image, the method comprising: in a data store, receiving a light-field image that has been captured with a light-field camera comprising an aperture, an image sensor, and a microlens array positioned between the aperture and the image sensor, wherein the light-field image comprises a plurality of lenslet images, each of which corresponds to one microlens of the microlens array; in a processor, using the light-field image to generate a mosaic of subaperture images, each of which comprises pixels from the same location on each of the lenslet images; in the processor, computing motion vectors indicative of motion of at least a primary subaperture image of the mosaic of subaperture images; in the processor, using the motion vectors to carry out shutter reconstruction of the mosaic of subaperture images to generate a blur-ready mosaic of subaperture images; in the processor, using the blur-ready mosaic of subaperture images to generate a motion-blurred light-field image; and outputting the motion-blurred light-field image.