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": [
"https://www.w3.org/ns/activitystreams#Public",
"http://mitra/users/admin"
],
"id": "http://pasture-one-actor/actor/jV5L4G3yCCU",
"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/AHd4Ts2vsW0",
"published": "2024-08-03T15:44:04Z",
"content": "no description",
"attachment": {
"type": "Document",
"url": "http://pasture-one-actor/images/100.png"
}
}
}
mitra
{
"id": "019118e9-8ef2-c033-b488-898d90f4783d",
"uri": "http://pasture-one-actor/actor/AHd4Ts2vsW0",
"url": null,
"created_at": "2024-08-03T15:44:04Z",
"edited_at": null,
"account": {
"id": "019118e7-ded9-7460-3eab-e229fb6ef7d0",
"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": "2024-08-03T15:42:14.744767Z",
"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": 23,
"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": "019118e9-8eef-fc4b-6837-0eac499b1c66",
"type": "image",
"url": "http://mitra/media/002b761fd30d6fd065e37e4ed16de7099a4ab0ee597f743b47b73d8fb1274dbd.png",
"preview_url": "http://mitra/media/002b761fd30d6fd065e37e4ed16de7099a4ab0ee597f743b47b73d8fb1274dbd.png",
"description": null
}
],
"mentions": [
{
"id": "019118e6-d690-71d3-ff0d-fec253e88c18",
"username": "admin",
"acct": "admin",
"url": "http://mitra/users/admin"
}
],
"tags": [],
"emojis": [],
"favourited": false,
"reblogged": false,
"pleroma": {
"emoji_reactions": [],
"in_reply_to_account_acct": null,
"quote": null,
"quote_visible": false
},
"ipfs_cid": 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": [
"https://www.w3.org/ns/activitystreams#Public",
"http://mitra/users/admin"
],
"id": "http://pasture-one-actor/actor/EG2djaIvX4s",
"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/2Yb2VU2Yujw",
"published": "2024-08-03T15:44:05Z",
"content": "text",
"attachment": {
"type": "Document",
"url": "http://pasture-one-actor/images/100.png",
"name": "name",
"summary": "summary",
"content": "content"
}
}
}
mitra
{
"id": "019118e9-94d1-392c-7aa1-d9db30f562a5",
"uri": "http://pasture-one-actor/actor/2Yb2VU2Yujw",
"url": null,
"created_at": "2024-08-03T15:44:05Z",
"edited_at": null,
"account": {
"id": "019118e7-ded9-7460-3eab-e229fb6ef7d0",
"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": "2024-08-03T15:42:14.744767Z",
"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": 24,
"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": "019118e9-94c8-893d-47b3-125a8828e98b",
"type": "image",
"url": "http://mitra/media/dc238c09d4880ea5b6fcad6adb887f0f51d25725bcfb9141477f3f98f775edaf.png",
"preview_url": "http://mitra/media/dc238c09d4880ea5b6fcad6adb887f0f51d25725bcfb9141477f3f98f775edaf.png",
"description": "name"
}
],
"mentions": [
{
"id": "019118e6-d690-71d3-ff0d-fec253e88c18",
"username": "admin",
"acct": "admin",
"url": "http://mitra/users/admin"
}
],
"tags": [],
"emojis": [],
"favourited": false,
"reblogged": false,
"pleroma": {
"emoji_reactions": [],
"in_reply_to_account_acct": null,
"quote": null,
"quote_visible": false
},
"ipfs_cid": 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": [
"https://www.w3.org/ns/activitystreams#Public",
"http://mitra/users/admin"
],
"id": "http://pasture-one-actor/actor/RNvlHziA0EI",
"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/V2J2iKGEOXM",
"published": "2024-08-03T15:44:07Z",
"content": "text",
"attachment": [
{
"type": "Document",
"url": "http://pasture-one-actor/assets/FediverseLogo.png",
"name": "name",
"imageType": "image/jpeg"
}
]
}
}
mitra
{
"id": "019118e9-9ac1-4d4e-d304-ea2a32e8cffc",
"uri": "http://pasture-one-actor/actor/V2J2iKGEOXM",
"url": null,
"created_at": "2024-08-03T15:44:07Z",
"edited_at": null,
"account": {
"id": "019118e7-ded9-7460-3eab-e229fb6ef7d0",
"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": "2024-08-03T15:42:14.744767Z",
"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": "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": "019118e9-9aba-511a-002d-cb7a0ad7ada5",
"type": "image",
"url": "http://mitra/media/2d7a61d31393a44edf2a30160cdd70b3582a4f97d5b550f8141dfee1641b4ae7.png",
"preview_url": "http://mitra/media/2d7a61d31393a44edf2a30160cdd70b3582a4f97d5b550f8141dfee1641b4ae7.png",
"description": "name"
}
],
"mentions": [
{
"id": "019118e6-d690-71d3-ff0d-fec253e88c18",
"username": "admin",
"acct": "admin",
"url": "http://mitra/users/admin"
}
],
"tags": [],
"emojis": [],
"favourited": false,
"reblogged": false,
"pleroma": {
"emoji_reactions": [],
"in_reply_to_account_acct": null,
"quote": null,
"quote_visible": false
},
"ipfs_cid": 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": [
"https://www.w3.org/ns/activitystreams#Public",
"http://mitra/users/admin"
],
"id": "http://pasture-one-actor/actor/7bgKNuEN2oM",
"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/Hp-0bCj7cF8",
"published": "2024-08-03T15:44:08Z",
"content": "no comment in attachment",
"attachment": [
{
"type": "Document",
"url": "http://pasture-one-actor/assets/FediverseLogo.png"
}
]
}
}
mitra
{
"id": "019118e9-a09e-ca80-2b95-76137343222d",
"uri": "http://pasture-one-actor/actor/Hp-0bCj7cF8",
"url": null,
"created_at": "2024-08-03T15:44:08Z",
"edited_at": null,
"account": {
"id": "019118e7-ded9-7460-3eab-e229fb6ef7d0",
"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": "2024-08-03T15:42:14.744767Z",
"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": "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": "019118e9-a097-be77-518d-e68e352fcd34",
"type": "image",
"url": "http://mitra/media/2d7a61d31393a44edf2a30160cdd70b3582a4f97d5b550f8141dfee1641b4ae7.png",
"preview_url": "http://mitra/media/2d7a61d31393a44edf2a30160cdd70b3582a4f97d5b550f8141dfee1641b4ae7.png",
"description": null
}
],
"mentions": [
{
"id": "019118e6-d690-71d3-ff0d-fec253e88c18",
"username": "admin",
"acct": "admin",
"url": "http://mitra/users/admin"
}
],
"tags": [],
"emojis": [],
"favourited": false,
"reblogged": false,
"pleroma": {
"emoji_reactions": [],
"in_reply_to_account_acct": null,
"quote": null,
"quote_visible": false
},
"ipfs_cid": null,
"links": []
}