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/-sCXljcz2LU",
"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/4i8Cl_xNMys",
"published": "2024-08-14T10:18:06Z",
"content": "no description",
"attachment": {
"type": "Document",
"url": "http://pasture-one-actor/images/100.png"
}
}
}
mitra
{
"id": "01915065-16b7-c706-90a6-2f43dc385fcc",
"uri": "http://pasture-one-actor/actor/4i8Cl_xNMys",
"url": null,
"created_at": "2024-08-14T10:18:06Z",
"edited_at": null,
"account": {
"id": "01915063-5d13-9e38-ee07-83619d956ac4",
"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": "2024-08-14T10:16:14.867539Z",
"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": "01915065-16b3-47b6-fd59-d4ec45a42e87",
"type": "image",
"url": "http://mitra/media/f40dd2e84c1094fdabfa5658d10bf798c22a3f31e63488dd70f4ebebf0751635.png",
"preview_url": "http://mitra/media/f40dd2e84c1094fdabfa5658d10bf798c22a3f31e63488dd70f4ebebf0751635.png",
"description": null
}
],
"mentions": [
{
"id": "01915062-5a32-ede5-d7a2-c4be34515e6a",
"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": [
"http://mitra/users/admin",
"https://www.w3.org/ns/activitystreams#Public"
],
"id": "http://pasture-one-actor/actor/Kc076Ts_4Y4",
"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/py6f-3yI4qM",
"published": "2024-08-14T10:18:08Z",
"content": "text",
"attachment": {
"type": "Document",
"url": "http://pasture-one-actor/images/100.png",
"name": "name",
"summary": "summary",
"content": "content"
}
}
}
mitra
{
"id": "01915065-1c90-37c1-4791-036b36d9942b",
"uri": "http://pasture-one-actor/actor/py6f-3yI4qM",
"url": null,
"created_at": "2024-08-14T10:18:08Z",
"edited_at": null,
"account": {
"id": "01915063-5d13-9e38-ee07-83619d956ac4",
"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": "2024-08-14T10:16:14.867539Z",
"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": "01915065-1c8d-0f8a-e80d-8336cf11d51c",
"type": "image",
"url": "http://mitra/media/fee7241b2cd73bb832f50052135fe3c83e7c6f3694dfd28efa4296b2a29287c3.png",
"preview_url": "http://mitra/media/fee7241b2cd73bb832f50052135fe3c83e7c6f3694dfd28efa4296b2a29287c3.png",
"description": "name"
}
],
"mentions": [
{
"id": "01915062-5a32-ede5-d7a2-c4be34515e6a",
"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": [
"http://mitra/users/admin",
"https://www.w3.org/ns/activitystreams#Public"
],
"id": "http://pasture-one-actor/actor/rpYIfxmJVhk",
"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/ytt6VJ0CtTo",
"published": "2024-08-14T10:18:09Z",
"content": "text",
"attachment": [
{
"type": "Document",
"url": "http://pasture-one-actor/assets/FediverseLogo.png",
"name": "name",
"imageType": "image/jpeg"
}
]
}
}
mitra
{
"id": "01915065-2293-6628-e1e9-e83ead6c4d16",
"uri": "http://pasture-one-actor/actor/ytt6VJ0CtTo",
"url": null,
"created_at": "2024-08-14T10:18:09Z",
"edited_at": null,
"account": {
"id": "01915063-5d13-9e38-ee07-83619d956ac4",
"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": "2024-08-14T10:16:14.867539Z",
"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": "01915065-228e-cc9f-50ae-7cd7b5776cfc",
"type": "image",
"url": "http://mitra/media/2d7a61d31393a44edf2a30160cdd70b3582a4f97d5b550f8141dfee1641b4ae7.png",
"preview_url": "http://mitra/media/2d7a61d31393a44edf2a30160cdd70b3582a4f97d5b550f8141dfee1641b4ae7.png",
"description": "name"
}
],
"mentions": [
{
"id": "01915062-5a32-ede5-d7a2-c4be34515e6a",
"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": [
"http://mitra/users/admin",
"https://www.w3.org/ns/activitystreams#Public"
],
"id": "http://pasture-one-actor/actor/z2pysoVIOwE",
"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/rxFIJr2irVk",
"published": "2024-08-14T10:18:11Z",
"content": "no comment in attachment",
"attachment": [
{
"type": "Document",
"url": "http://pasture-one-actor/assets/FediverseLogo.png"
}
]
}
}
mitra
{
"id": "01915065-285d-fbb3-ce5c-5eeeef3e2a93",
"uri": "http://pasture-one-actor/actor/rxFIJr2irVk",
"url": null,
"created_at": "2024-08-14T10:18:11Z",
"edited_at": null,
"account": {
"id": "01915063-5d13-9e38-ee07-83619d956ac4",
"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": "2024-08-14T10:16:14.867539Z",
"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": "01915065-2859-ea40-4dcc-4951e13d0ba0",
"type": "image",
"url": "http://mitra/media/2d7a61d31393a44edf2a30160cdd70b3582a4f97d5b550f8141dfee1641b4ae7.png",
"preview_url": "http://mitra/media/2d7a61d31393a44edf2a30160cdd70b3582a4f97d5b550f8141dfee1641b4ae7.png",
"description": null
}
],
"mentions": [
{
"id": "01915062-5a32-ede5-d7a2-c4be34515e6a",
"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": []
}