return {
    still_image_file = {
        presentation_type = "image",

        -- Transformers for site generation.
        transformers = {
            -- Main deliverable asset.
            pres = {fn = "img_resize", ext = ".jpg", 1024},
            -- Thumbnail derivative.
            thumbnail = {fn = "img_resize", ext = ".jpg", 256},
        },
    },
}