Image Description¶
The Image type is defined in ActivityStreams Vocabulary.
In this support table, we only consider how the image description, commonly called AltText is handled. Image descriptions are important from an accessibility standpoint, see WCAG 2.2. Text Alternatives.
It seems that certain implementations, e.g. firefish, store the image description on a per image URL basis and not for every instance of an image reference.
Examples¶
Example 1¶
activity
{
"@context": [
"https://www.w3.org/ns/activitystreams",
{
"Hashtag": "as:Hashtag",
"sensitive": "as:sensitive"
}
],
"type": "Create",
"actor": "http://pasture_one_actor/actor",
"to": [
"http://mitra/users/admin",
"https://www.w3.org/ns/activitystreams#Public"
],
"id": "http://pasture_one_actor/actor/WRqRsLGXKSo",
"object": {
"type": "Note",
"attributedTo": "http://pasture_one_actor/actor",
"to": [
"https://www.w3.org/ns/activitystreams#Public",
"http://mitra/users/admin"
],
"id": "http://pasture_one_actor/actor/vfFpjRhOurw",
"published": "2024-02-28T16:59:17Z",
"content": "no description",
"attachment": {
"type": "Document",
"url": "http://pasture_one_actor/images/100.png"
}
}
}
mitra
{
"id": "018df0a8-0429-f1e4-0fb3-5902deba4139",
"uri": "http://pasture_one_actor/actor/vfFpjRhOurw",
"url": null,
"created_at": "2024-02-28T16:59:17Z",
"edited_at": null,
"account": {
"id": "018df09f-1a24-4e01-0141-e371bf1c13a6",
"username": "actor",
"acct": "actor@pasture_one_actor",
"actor_id": "http://pasture_one_actor/actor",
"url": "http://pasture_one_actor/actor",
"display_name": "Test Actor",
"created_at": "2024-02-28T16:49:35.268860Z",
"note": "",
"avatar": null,
"header": null,
"locked": false,
"mention_policy": "none",
"bot": false,
"identity_proofs": [],
"payment_options": [],
"fields": [],
"emojis": [],
"followers_count": 0,
"following_count": 0,
"subscribers_count": 0,
"statuses_count": 25,
"source": null,
"role": null,
"authentication_methods": null,
"client_config": null
},
"content": "no description",
"in_reply_to_id": null,
"in_reply_to_account_id": null,
"reblog": null,
"visibility": "public",
"sensitive": false,
"spoiler_text": "",
"pinned": false,
"replies_count": 0,
"favourites_count": 0,
"reblogs_count": 0,
"media_attachments": [
{
"id": "018df0a8-0424-0938-99ef-f607566c9fcc",
"type": "image",
"url": "http://mitra/media/038ddc72f9a981f291b3aeda795207d6f622b8344db2b8b3ef7508407d32ba8f.png",
"preview_url": "http://mitra/media/038ddc72f9a981f291b3aeda795207d6f622b8344db2b8b3ef7508407d32ba8f.png",
"description": null
}
],
"mentions": [
{
"id": "018df09e-1831-5367-8e8c-52e388bac223",
"username": "admin",
"acct": "admin",
"url": "http://mitra/users/admin"
}
],
"tags": [],
"emojis": [],
"favourited": false,
"reblogged": false,
"ipfs_cid": null,
"token_id": null,
"token_tx_id": null,
"links": []
}
Example 2¶
activity
{
"@context": [
"https://www.w3.org/ns/activitystreams",
{
"Hashtag": "as:Hashtag",
"sensitive": "as:sensitive"
}
],
"type": "Create",
"actor": "http://pasture_one_actor/actor",
"to": [
"http://mitra/users/admin",
"https://www.w3.org/ns/activitystreams#Public"
],
"id": "http://pasture_one_actor/actor/gz0-X0z8q2E",
"object": {
"type": "Note",
"attributedTo": "http://pasture_one_actor/actor",
"to": [
"https://www.w3.org/ns/activitystreams#Public",
"http://mitra/users/admin"
],
"id": "http://pasture_one_actor/actor/0nb4WiJpff4",
"published": "2024-02-28T16:59:37Z",
"content": "text",
"attachment": {
"type": "Document",
"url": "http://pasture_one_actor/images/100.png",
"name": "name",
"summary": "summary",
"content": "content"
}
}
}
mitra
{
"id": "018df0a8-5238-faa9-34b8-612e8b2d5c34",
"uri": "http://pasture_one_actor/actor/0nb4WiJpff4",
"url": null,
"created_at": "2024-02-28T16:59:37Z",
"edited_at": null,
"account": {
"id": "018df09f-1a24-4e01-0141-e371bf1c13a6",
"username": "actor",
"acct": "actor@pasture_one_actor",
"actor_id": "http://pasture_one_actor/actor",
"url": "http://pasture_one_actor/actor",
"display_name": "Test Actor",
"created_at": "2024-02-28T16:49:35.268860Z",
"note": "",
"avatar": null,
"header": null,
"locked": false,
"mention_policy": "none",
"bot": false,
"identity_proofs": [],
"payment_options": [],
"fields": [],
"emojis": [],
"followers_count": 0,
"following_count": 0,
"subscribers_count": 0,
"statuses_count": 26,
"source": null,
"role": null,
"authentication_methods": null,
"client_config": null
},
"content": "text",
"in_reply_to_id": null,
"in_reply_to_account_id": null,
"reblog": null,
"visibility": "public",
"sensitive": false,
"spoiler_text": "",
"pinned": false,
"replies_count": 0,
"favourites_count": 0,
"reblogs_count": 0,
"media_attachments": [
{
"id": "018df0a8-5234-7930-6ea8-9b61435fd314",
"type": "image",
"url": "http://mitra/media/2cbe4c5f5476bf97c6894481acf4f56842c0db93dc3cf42a333f1df94d5d2485.png",
"preview_url": "http://mitra/media/2cbe4c5f5476bf97c6894481acf4f56842c0db93dc3cf42a333f1df94d5d2485.png",
"description": "name"
}
],
"mentions": [
{
"id": "018df09e-1831-5367-8e8c-52e388bac223",
"username": "admin",
"acct": "admin",
"url": "http://mitra/users/admin"
}
],
"tags": [],
"emojis": [],
"favourited": false,
"reblogged": false,
"ipfs_cid": null,
"token_id": null,
"token_tx_id": null,
"links": []
}
Example 3¶
activity
{
"@context": [
"https://www.w3.org/ns/activitystreams",
{
"Hashtag": "as:Hashtag",
"sensitive": "as:sensitive"
}
],
"type": "Create",
"actor": "http://pasture_one_actor/actor",
"to": [
"http://mitra/users/admin",
"https://www.w3.org/ns/activitystreams#Public"
],
"id": "http://pasture_one_actor/actor/0uSx2fcAJDY",
"object": {
"type": "Note",
"attributedTo": "http://pasture_one_actor/actor",
"to": [
"https://www.w3.org/ns/activitystreams#Public",
"http://mitra/users/admin"
],
"id": "http://pasture_one_actor/actor/OQQZjaEm8R0",
"published": "2024-02-28T16:59:57Z",
"content": "text",
"attachment": [
{
"type": "Document",
"url": "http://pasture_one_actor/assets/FediverseLogo.png",
"name": "name",
"imageType": "image/jpeg"
}
]
}
}
mitra
{
"id": "018df0a8-a066-e4df-45e5-b923baef6c81",
"uri": "http://pasture_one_actor/actor/OQQZjaEm8R0",
"url": null,
"created_at": "2024-02-28T16:59:57Z",
"edited_at": null,
"account": {
"id": "018df09f-1a24-4e01-0141-e371bf1c13a6",
"username": "actor",
"acct": "actor@pasture_one_actor",
"actor_id": "http://pasture_one_actor/actor",
"url": "http://pasture_one_actor/actor",
"display_name": "Test Actor",
"created_at": "2024-02-28T16:49:35.268860Z",
"note": "",
"avatar": null,
"header": null,
"locked": false,
"mention_policy": "none",
"bot": false,
"identity_proofs": [],
"payment_options": [],
"fields": [],
"emojis": [],
"followers_count": 0,
"following_count": 0,
"subscribers_count": 0,
"statuses_count": 27,
"source": null,
"role": null,
"authentication_methods": null,
"client_config": null
},
"content": "text",
"in_reply_to_id": null,
"in_reply_to_account_id": null,
"reblog": null,
"visibility": "public",
"sensitive": false,
"spoiler_text": "",
"pinned": false,
"replies_count": 0,
"favourites_count": 0,
"reblogs_count": 0,
"media_attachments": [
{
"id": "018df0a8-a062-f4da-fc42-b18d5651872a",
"type": "image",
"url": "http://mitra/media/2d7a61d31393a44edf2a30160cdd70b3582a4f97d5b550f8141dfee1641b4ae7.png",
"preview_url": "http://mitra/media/2d7a61d31393a44edf2a30160cdd70b3582a4f97d5b550f8141dfee1641b4ae7.png",
"description": "name"
}
],
"mentions": [
{
"id": "018df09e-1831-5367-8e8c-52e388bac223",
"username": "admin",
"acct": "admin",
"url": "http://mitra/users/admin"
}
],
"tags": [],
"emojis": [],
"favourited": false,
"reblogged": false,
"ipfs_cid": null,
"token_id": null,
"token_tx_id": null,
"links": []
}
Example 4¶
activity
{
"@context": [
"https://www.w3.org/ns/activitystreams",
{
"Hashtag": "as:Hashtag",
"sensitive": "as:sensitive"
}
],
"type": "Create",
"actor": "http://pasture_one_actor/actor",
"to": [
"http://mitra/users/admin",
"https://www.w3.org/ns/activitystreams#Public"
],
"id": "http://pasture_one_actor/actor/egtJVoXFyrs",
"object": {
"type": "Note",
"attributedTo": "http://pasture_one_actor/actor",
"to": [
"https://www.w3.org/ns/activitystreams#Public",
"http://mitra/users/admin"
],
"id": "http://pasture_one_actor/actor/20UUS7XSB3U",
"published": "2024-02-28T17:00:17Z",
"content": "no comment in attachment",
"attachment": [
{
"type": "Document",
"url": "http://pasture_one_actor/assets/FediverseLogo.png"
}
]
}
}
mitra
{
"id": "018df0a9-020b-eb3b-b6e6-43b27f8f2a58",
"uri": "http://pasture_one_actor/actor/20UUS7XSB3U",
"url": null,
"created_at": "2024-02-28T17:00:17Z",
"edited_at": null,
"account": {
"id": "018df09f-1a24-4e01-0141-e371bf1c13a6",
"username": "actor",
"acct": "actor@pasture_one_actor",
"actor_id": "http://pasture_one_actor/actor",
"url": "http://pasture_one_actor/actor",
"display_name": "Test Actor",
"created_at": "2024-02-28T16:49:35.268860Z",
"note": "",
"avatar": null,
"header": null,
"locked": false,
"mention_policy": "none",
"bot": false,
"identity_proofs": [],
"payment_options": [],
"fields": [],
"emojis": [],
"followers_count": 0,
"following_count": 0,
"subscribers_count": 0,
"statuses_count": 28,
"source": null,
"role": null,
"authentication_methods": null,
"client_config": null
},
"content": "no comment in attachment",
"in_reply_to_id": null,
"in_reply_to_account_id": null,
"reblog": null,
"visibility": "public",
"sensitive": false,
"spoiler_text": "",
"pinned": false,
"replies_count": 0,
"favourites_count": 0,
"reblogs_count": 0,
"media_attachments": [
{
"id": "018df0a9-0208-e9ed-55a9-4e7ded7acea6",
"type": "image",
"url": "http://mitra/media/2d7a61d31393a44edf2a30160cdd70b3582a4f97d5b550f8141dfee1641b4ae7.png",
"preview_url": "http://mitra/media/2d7a61d31393a44edf2a30160cdd70b3582a4f97d5b550f8141dfee1641b4ae7.png",
"description": null
}
],
"mentions": [
{
"id": "018df09e-1831-5367-8e8c-52e388bac223",
"username": "admin",
"acct": "admin",
"url": "http://mitra/users/admin"
}
],
"tags": [],
"emojis": [],
"favourited": false,
"reblogged": false,
"ipfs_cid": null,
"token_id": null,
"token_tx_id": null,
"links": []
}