A particularly fun detail of the https://til.simonwillison.net/tools/annotated-presentations tool is how it uses Tesseract.js OCR (running in the browser) to extract suggested alt= text from the images

I wrote more about that in this TIL: https://til.simonwillison.net/javascript/tesseract-ocr-javascript

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I also shared four ChatGPT transcripts from sessions I used to help me cobble that annotated presentation together https://simonwillison.net/2023/Aug/6/annotated-presentations/#chatgpt-sessions