Image

Description
content string A plain-text description for the image.
name string A plain-text name for the image.
url string Identifies one link where the image can be reach.
mediaType string identifies the MIME media type of the image.
type string must be Image

Note: Document message is any file others than Image, Video or Audio.

Example Image object

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{
    "@context": "https://www.w3.org/ns/activitystreams",
    "actor": {
        "id": "",
        "name": "John Doe",
        "type": "Person"
    },
    "generator": {
        "id": "",
        "name": "slack",
        "type": "Service"
    },
    "object": {
    "type": "Image",
    "id": "",
    "url": "http://images.nationalgeographic.com/wpf/media-live/photos/000/090/cache/african-elephant-standing_9033_600x450.jpg",
    "mediaType": "image/jpeg"
    },
    "published": 1484195107,
    "target": {
        "id": "",
        "name": "Sally Doe",
        "type": "Person"
    },
    "type": "Create"
}