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¶
```json title="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/nkKkNR7OJaI",
"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/iJP-BRuybV4",
"published": "2024-03-06T18:20:28Z",
"content": "no description",
"attachment": {
"type": "Document",
"url": "http://pasture_one_actor/images/100.png"
}
}
}
```
```json title="mitra"
{
"id": "018e14fe-d81e-5ac1-66e8-d6ad83ce0c6b",
"uri": "http://pasture_one_actor/actor/iJP-BRuybV4",
"url": null,
"created_at": "2024-03-06T18:20:28Z",
"edited_at": null,
"account": {
"id": "018e14f5-f041-23ce-02af-d040b908c232",
"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": "2024-03-06T18:10:45.953735Z",
"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": "018e14fe-d817-8242-500c-0c7baf881569",
"type": "image",
"url": "http://mitra/media/120ff2ac49401e5d04dae8e4d64d1e34c514f1748cf47e8e072fadadd3978043.png",
"preview_url": "http://mitra/media/120ff2ac49401e5d04dae8e4d64d1e34c514f1748cf47e8e072fadadd3978043.png",
"description": null
}
],
"mentions": [
{
"id": "018e14f4-d873-ad2f-57db-aa3652520cfb",
"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¶
```json title="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/j81LnmC3pSc",
"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/8oPN0SkKM00",
"published": "2024-03-06T18:20:48Z",
"content": "text",
"attachment": {
"type": "Document",
"url": "http://pasture_one_actor/images/100.png",
"name": "name",
"summary": "summary",
"content": "content"
}
}
}
```
```json title="mitra"
{
"id": "018e14ff-39c1-3e21-8091-f593113184ad",
"uri": "http://pasture_one_actor/actor/8oPN0SkKM00",
"url": null,
"created_at": "2024-03-06T18:20:48Z",
"edited_at": null,
"account": {
"id": "018e14f5-f041-23ce-02af-d040b908c232",
"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": "2024-03-06T18:10:45.953735Z",
"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": "018e14ff-39ba-f374-4084-0427d97bad5a",
"type": "image",
"url": "http://mitra/media/dbc4400c903fee174aa8d497027db38495d6989d3a1083c73e522679717f3038.png",
"preview_url": "http://mitra/media/dbc4400c903fee174aa8d497027db38495d6989d3a1083c73e522679717f3038.png",
"description": "name"
}
],
"mentions": [
{
"id": "018e14f4-d873-ad2f-57db-aa3652520cfb",
"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¶
```json title="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/klEO411txGQ",
"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/YqrKWkGXIaY",
"published": "2024-03-06T18:21:08Z",
"content": "text",
"attachment": [
{
"type": "Document",
"url": "http://pasture_one_actor/assets/FediverseLogo.png",
"name": "name",
"imageType": "image/jpeg"
}
]
}
}
```
```json title="mitra"
{
"id": "018e14ff-87d0-5206-de21-179e5a9b33d5",
"uri": "http://pasture_one_actor/actor/YqrKWkGXIaY",
"url": null,
"created_at": "2024-03-06T18:21:08Z",
"edited_at": null,
"account": {
"id": "018e14f5-f041-23ce-02af-d040b908c232",
"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": "2024-03-06T18:10:45.953735Z",
"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": "018e14ff-87cd-2716-2642-2b28dc596321",
"type": "image",
"url": "http://mitra/media/2d7a61d31393a44edf2a30160cdd70b3582a4f97d5b550f8141dfee1641b4ae7.png",
"preview_url": "http://mitra/media/2d7a61d31393a44edf2a30160cdd70b3582a4f97d5b550f8141dfee1641b4ae7.png",
"description": "name"
}
],
"mentions": [
{
"id": "018e14f4-d873-ad2f-57db-aa3652520cfb",
"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¶
```json title="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/V9-eqBFEsu8",
"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/ebdmfDm0Uww",
"published": "2024-03-06T18:21:28Z",
"content": "no comment in attachment",
"attachment": [
{
"type": "Document",
"url": "http://pasture_one_actor/assets/FediverseLogo.png"
}
]
}
}
```
```json title="mitra"
{
"id": "018e14ff-d5f1-d4c6-962c-8b7a33553903",
"uri": "http://pasture_one_actor/actor/ebdmfDm0Uww",
"url": null,
"created_at": "2024-03-06T18:21:28Z",
"edited_at": null,
"account": {
"id": "018e14f5-f041-23ce-02af-d040b908c232",
"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": "2024-03-06T18:10:45.953735Z",
"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": "018e14ff-d5ed-1363-2905-fecca620a6c4",
"type": "image",
"url": "http://mitra/media/2d7a61d31393a44edf2a30160cdd70b3582a4f97d5b550f8141dfee1641b4ae7.png",
"preview_url": "http://mitra/media/2d7a61d31393a44edf2a30160cdd70b3582a4f97d5b550f8141dfee1641b4ae7.png",
"description": null
}
],
"mentions": [
{
"id": "018e14f4-d873-ad2f-57db-aa3652520cfb",
"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": []
}
```