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A helpful graphic about writing alt text
(lemmy.ml)
image description
An infographic titled “How To Write Alt Text” featuring a photo of a capybara. Parts of alt text are divided by color, including "identify who", "expression", "description", "colour", and "interesting features". The finished description reads “A capybara looking relaxed in a hot spa. Yellow yuzu fruits are floating in the water, and one is balanced on the top of the capybara’s head.”
via https://www.perkins.org/resource/how-write-alt-text-and-image-descriptions-visually-impaired/
It’s only useful if the AI was trained on similar prompts. A lot of the anime style ones work best with lists of tags, while the realistic ones work best with descriptions like above.