You can tweak your instance theme so that it highlights media which do not have a text description:
A lot of people use Mastodon through audio from screen readers, so it is important to encourage your users to add text descriptions to images.
@changeling unfortunately since there's no metadata available on the parent / ancestors of the image element that indicates there is no image description available, I don't think that's possible with just CSS, as CSS currently doesn't have a parent selector.
While not the original topic of the feature request, the "Setting to require alt text for image uploads" mastodon issue on github has some discussion regarding a request for a filter toggle to hide posts without image descriptions.
The thread does raise an interesting question though: do you still expect an explicit image description when the image's content is already clear from the body of the post? e.g. if I post a picture of a cute dog with the status body text "A cute dog greeted me on the way home", do you still expect the image description to say something like "Photo of a cute dog"?
@zleap How reliable OCR is depends on the quality of the image. English black text on a white background will be recognized fairly well, anything with a worse contrast or different symbols will be converted with less success.
Still though, if it can't do anything, it should at least show you an error, so that's odd. Since Qobo is using a fairly modified version of Mastodon, you might wish to reach out to your instance administrator.
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