Handling Different Modalities: Charts, Slides, Screenshots, and Handwriting
~13 min read
Not all visual content is equally hard to handle — charts, slides, screenshots, and handwritten notes each have distinct failure modes that shape how a multimodal RAG pipeline should treat them.
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Key points
- •Charts are reliable for gist ('trending up') but less reliable for precise values — extracting underlying structured data as a backup improves precision when available
- •Slide decks convey meaning through text, images, AND spatial layout together — treating a whole slide as one unit often preserves this better than splitting elements out
- •Screenshots have crisp, unambiguous text (OCR handles it well) but the harder challenge is often interpreting UI structure, not reading the text itself
- •Handwritten notes are the most failure-prone category due to enormous visual variation between writers — production pipelines often add confidence scoring or human-review fallback
- •A production pipeline benefits from classifying content type and applying type-appropriate handling, rather than one uniform 'extract and embed' step for every image