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://gotosocial/users/cookie"
],
"id": "http://pasture-one-actor/actor/XBuBzSvjWLY",
"published": "2024-10-26T08:49:54Z",
"object": {
"type": "Note",
"attributedTo": "http://pasture-one-actor/actor",
"to": [
"https://www.w3.org/ns/activitystreams#Public",
"http://gotosocial/users/cookie"
],
"id": "http://pasture-one-actor/actor/DH_cT_W4fF0",
"published": "2024-10-26T08:49:54Z",
"content": "no description",
"attachment": {
"type": "Document",
"url": "http://pasture-one-actor/images/100.png"
},
"tag": [
{
"type": "Mention",
"href": "http://gotosocial/users/cookie"
}
]
}
}
gotosocial
{
"id": "01JB4092TGAWNVZCMN64PAX07Z",
"created_at": "2024-10-26T08:49:54.000Z",
"in_reply_to_id": null,
"in_reply_to_account_id": null,
"sensitive": false,
"spoiler_text": "",
"visibility": "public",
"language": null,
"uri": "http://pasture-one-actor/actor/DH_cT_W4fF0",
"url": "http://pasture-one-actor/actor/DH_cT_W4fF0",
"replies_count": 0,
"reblogs_count": 0,
"favourites_count": 0,
"favourited": false,
"reblogged": false,
"muted": false,
"bookmarked": false,
"pinned": false,
"content": "no description",
"reblog": null,
"account": {
"id": "01JB406J7N5Z0WY56CB5KSGDGA",
"username": "actor",
"acct": "actor@pasture-one-actor",
"display_name": "Test Actor",
"locked": true,
"discoverable": false,
"bot": false,
"created_at": "2024-10-26T08:48:31.488Z",
"note": "",
"url": "http://pasture-one-actor/actor",
"avatar": "http://gotosocial/assets/default_avatars/GoToSocial_icon6.png",
"avatar_static": "http://gotosocial/assets/default_avatars/GoToSocial_icon6.png",
"header": "http://gotosocial/assets/default_header.png",
"header_static": "http://gotosocial/assets/default_header.png",
"followers_count": 0,
"following_count": 0,
"statuses_count": 30,
"last_status_at": "2024-10-26T08:49:54.000Z",
"emojis": [],
"fields": []
},
"media_attachments": [
{
"id": "01JB4093SCTS54SWK8Q68CRJ8Y",
"type": "image",
"url": "http://gotosocial/fileserver/01JB406J7N5Z0WY56CB5KSGDGA/attachment/original/01JB4093SCTS54SWK8Q68CRJ8Y.png",
"text_url": "http://gotosocial/fileserver/01JB406J7N5Z0WY56CB5KSGDGA/attachment/original/01JB4093SCTS54SWK8Q68CRJ8Y.png",
"preview_url": "http://gotosocial/fileserver/01JB406J7N5Z0WY56CB5KSGDGA/attachment/small/01JB4093SCTS54SWK8Q68CRJ8Y.jpg",
"remote_url": "http://pasture-one-actor/images/100.png",
"preview_remote_url": null,
"meta": {
"original": {
"width": 40,
"height": 40,
"size": "40x40",
"aspect": 1
},
"small": {
"width": 40,
"height": 40,
"size": "40x40",
"aspect": 1
},
"focus": {
"x": 0,
"y": 0
}
},
"description": null,
"blurhash": "L74Sn2l*fQl*l*f*fQf*fQfQfQfQ"
}
],
"mentions": [
{
"id": "01N304667NDPR3W9JH5AD5H4SW",
"username": "cookie",
"url": "http://gotosocial/@cookie",
"acct": "cookie"
}
],
"tags": [],
"emojis": [],
"card": null,
"poll": null
}
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://gotosocial/users/cookie"
],
"id": "http://pasture-one-actor/actor/Myj8u8uzyiI",
"published": "2024-10-26T08:49:55Z",
"object": {
"type": "Note",
"attributedTo": "http://pasture-one-actor/actor",
"to": [
"https://www.w3.org/ns/activitystreams#Public",
"http://gotosocial/users/cookie"
],
"id": "http://pasture-one-actor/actor/M9birmV0n6k",
"published": "2024-10-26T08:49:55Z",
"content": "text",
"attachment": {
"type": "Document",
"url": "http://pasture-one-actor/images/100.png",
"name": "name",
"summary": "summary",
"content": "content"
},
"tag": [
{
"type": "Mention",
"href": "http://gotosocial/users/cookie"
}
]
}
}
gotosocial
{
"id": "01JB4093SRM3KC338PFRH1EQ9M",
"created_at": "2024-10-26T08:49:55.000Z",
"in_reply_to_id": null,
"in_reply_to_account_id": null,
"sensitive": false,
"spoiler_text": "",
"visibility": "public",
"language": null,
"uri": "http://pasture-one-actor/actor/M9birmV0n6k",
"url": "http://pasture-one-actor/actor/M9birmV0n6k",
"replies_count": 0,
"reblogs_count": 0,
"favourites_count": 0,
"favourited": false,
"reblogged": false,
"muted": false,
"bookmarked": false,
"pinned": false,
"content": "text",
"reblog": null,
"account": {
"id": "01JB406J7N5Z0WY56CB5KSGDGA",
"username": "actor",
"acct": "actor@pasture-one-actor",
"display_name": "Test Actor",
"locked": true,
"discoverable": false,
"bot": false,
"created_at": "2024-10-26T08:48:31.488Z",
"note": "",
"url": "http://pasture-one-actor/actor",
"avatar": "http://gotosocial/assets/default_avatars/GoToSocial_icon6.png",
"avatar_static": "http://gotosocial/assets/default_avatars/GoToSocial_icon6.png",
"header": "http://gotosocial/assets/default_header.png",
"header_static": "http://gotosocial/assets/default_header.png",
"followers_count": 0,
"following_count": 0,
"statuses_count": 31,
"last_status_at": "2024-10-26T08:49:55.000Z",
"emojis": [],
"fields": []
},
"media_attachments": [
{
"id": "01JB4094EF875SBRNCPJBYA003",
"type": "image",
"url": "http://gotosocial/fileserver/01JB406J7N5Z0WY56CB5KSGDGA/attachment/original/01JB4094EF875SBRNCPJBYA003.png",
"text_url": "http://gotosocial/fileserver/01JB406J7N5Z0WY56CB5KSGDGA/attachment/original/01JB4094EF875SBRNCPJBYA003.png",
"preview_url": "http://gotosocial/fileserver/01JB406J7N5Z0WY56CB5KSGDGA/attachment/small/01JB4094EF875SBRNCPJBYA003.jpg",
"remote_url": "http://pasture-one-actor/images/100.png",
"preview_remote_url": null,
"meta": {
"original": {
"width": 40,
"height": 40,
"size": "40x40",
"aspect": 1
},
"small": {
"width": 40,
"height": 40,
"size": "40x40",
"aspect": 1
},
"focus": {
"x": 0,
"y": 0
}
},
"description": "summary",
"blurhash": "L1Ee_i~XfQ~X~XoffQoffQfQfQfQ"
}
],
"mentions": [
{
"id": "01N304667NDPR3W9JH5AD5H4SW",
"username": "cookie",
"url": "http://gotosocial/@cookie",
"acct": "cookie"
}
],
"tags": [],
"emojis": [],
"card": null,
"poll": null
}
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://gotosocial/users/cookie"
],
"id": "http://pasture-one-actor/actor/-Mk2HiLIno0",
"published": "2024-10-26T08:49:56Z",
"object": {
"type": "Note",
"attributedTo": "http://pasture-one-actor/actor",
"to": [
"https://www.w3.org/ns/activitystreams#Public",
"http://gotosocial/users/cookie"
],
"id": "http://pasture-one-actor/actor/eT52aGL7VaI",
"published": "2024-10-26T08:49:56Z",
"content": "text",
"attachment": [
{
"type": "Document",
"url": "http://pasture-one-actor/assets/FediverseLogo.png",
"name": "name",
"imageType": "image/jpeg"
}
],
"tag": [
{
"type": "Mention",
"href": "http://gotosocial/users/cookie"
}
]
}
}
gotosocial
{
"id": "01JB4094S0MRCWR3RJX06S2NEV",
"created_at": "2024-10-26T08:49:56.000Z",
"in_reply_to_id": null,
"in_reply_to_account_id": null,
"sensitive": false,
"spoiler_text": "",
"visibility": "public",
"language": null,
"uri": "http://pasture-one-actor/actor/eT52aGL7VaI",
"url": "http://pasture-one-actor/actor/eT52aGL7VaI",
"replies_count": 0,
"reblogs_count": 0,
"favourites_count": 0,
"favourited": false,
"reblogged": false,
"muted": false,
"bookmarked": false,
"pinned": false,
"content": "text",
"reblog": null,
"account": {
"id": "01JB406J7N5Z0WY56CB5KSGDGA",
"username": "actor",
"acct": "actor@pasture-one-actor",
"display_name": "Test Actor",
"locked": true,
"discoverable": false,
"bot": false,
"created_at": "2024-10-26T08:48:31.488Z",
"note": "",
"url": "http://pasture-one-actor/actor",
"avatar": "http://gotosocial/assets/default_avatars/GoToSocial_icon6.png",
"avatar_static": "http://gotosocial/assets/default_avatars/GoToSocial_icon6.png",
"header": "http://gotosocial/assets/default_header.png",
"header_static": "http://gotosocial/assets/default_header.png",
"followers_count": 0,
"following_count": 0,
"statuses_count": 32,
"last_status_at": "2024-10-26T08:49:56.000Z",
"emojis": [],
"fields": []
},
"media_attachments": [
{
"id": "01JB40952ZCBA8S3A7FR02EN6P",
"type": "image",
"url": "http://gotosocial/fileserver/01JB406J7N5Z0WY56CB5KSGDGA/attachment/original/01JB40952ZCBA8S3A7FR02EN6P.png",
"text_url": "http://gotosocial/fileserver/01JB406J7N5Z0WY56CB5KSGDGA/attachment/original/01JB40952ZCBA8S3A7FR02EN6P.png",
"preview_url": "http://gotosocial/fileserver/01JB406J7N5Z0WY56CB5KSGDGA/attachment/small/01JB40952ZCBA8S3A7FR02EN6P.jpg",
"remote_url": "http://pasture-one-actor/assets/FediverseLogo.png",
"preview_remote_url": null,
"meta": {
"original": {
"width": 1548,
"height": 1548,
"size": "1548x1548",
"aspect": 1
},
"small": {
"width": 512,
"height": 512,
"size": "512x512",
"aspect": 1
},
"focus": {
"x": 0,
"y": 0
}
},
"description": "name",
"blurhash": "LIB{x~.}9Fcn}gnOEUxBDlK[N1wi"
}
],
"mentions": [
{
"id": "01N304667NDPR3W9JH5AD5H4SW",
"username": "cookie",
"url": "http://gotosocial/@cookie",
"acct": "cookie"
}
],
"tags": [],
"emojis": [],
"card": null,
"poll": null
}
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://gotosocial/users/cookie"
],
"id": "http://pasture-one-actor/actor/UmQPxXOrKTY",
"published": "2024-10-26T08:49:56Z",
"object": {
"type": "Note",
"attributedTo": "http://pasture-one-actor/actor",
"to": [
"https://www.w3.org/ns/activitystreams#Public",
"http://gotosocial/users/cookie"
],
"id": "http://pasture-one-actor/actor/oF-GzctdGyA",
"published": "2024-10-26T08:49:56Z",
"content": "no comment in attachment",
"attachment": [
{
"type": "Document",
"url": "http://pasture-one-actor/assets/FediverseLogo.png"
}
],
"tag": [
{
"type": "Mention",
"href": "http://gotosocial/users/cookie"
}
]
}
}
gotosocial
{
"id": "01JB4094S0DPARTNKXRESS9K6A",
"created_at": "2024-10-26T08:49:56.000Z",
"in_reply_to_id": null,
"in_reply_to_account_id": null,
"sensitive": false,
"spoiler_text": "",
"visibility": "public",
"language": null,
"uri": "http://pasture-one-actor/actor/oF-GzctdGyA",
"url": "http://pasture-one-actor/actor/oF-GzctdGyA",
"replies_count": 0,
"reblogs_count": 0,
"favourites_count": 0,
"favourited": false,
"reblogged": false,
"muted": false,
"bookmarked": false,
"pinned": false,
"content": "no comment in attachment",
"reblog": null,
"account": {
"id": "01JB406J7N5Z0WY56CB5KSGDGA",
"username": "actor",
"acct": "actor@pasture-one-actor",
"display_name": "Test Actor",
"locked": true,
"discoverable": false,
"bot": false,
"created_at": "2024-10-26T08:48:31.488Z",
"note": "",
"url": "http://pasture-one-actor/actor",
"avatar": "http://gotosocial/assets/default_avatars/GoToSocial_icon6.png",
"avatar_static": "http://gotosocial/assets/default_avatars/GoToSocial_icon6.png",
"header": "http://gotosocial/assets/default_header.png",
"header_static": "http://gotosocial/assets/default_header.png",
"followers_count": 0,
"following_count": 0,
"statuses_count": 33,
"last_status_at": "2024-10-26T08:49:56.000Z",
"emojis": [],
"fields": []
},
"media_attachments": [
{
"id": "01JB4095QVFCRAH0TVEPW25H2N",
"type": "image",
"url": "http://gotosocial/fileserver/01JB406J7N5Z0WY56CB5KSGDGA/attachment/original/01JB4095QVFCRAH0TVEPW25H2N.png",
"text_url": "http://gotosocial/fileserver/01JB406J7N5Z0WY56CB5KSGDGA/attachment/original/01JB4095QVFCRAH0TVEPW25H2N.png",
"preview_url": "http://gotosocial/fileserver/01JB406J7N5Z0WY56CB5KSGDGA/attachment/small/01JB4095QVFCRAH0TVEPW25H2N.jpg",
"remote_url": "http://pasture-one-actor/assets/FediverseLogo.png",
"preview_remote_url": null,
"meta": {
"original": {
"width": 1548,
"height": 1548,
"size": "1548x1548",
"aspect": 1
},
"small": {
"width": 512,
"height": 512,
"size": "512x512",
"aspect": 1
},
"focus": {
"x": 0,
"y": 0
}
},
"description": null,
"blurhash": "LIB{x~.}9Fcn}gnOEUxBDlK[N1wi"
}
],
"mentions": [
{
"id": "01N304667NDPR3W9JH5AD5H4SW",
"username": "cookie",
"url": "http://gotosocial/@cookie",
"acct": "cookie"
}
],
"tags": [],
"emojis": [],
"card": null,
"poll": null
}