Chart data extraction guides
Methods, tool comparisons, and worked examples for extracting chart data and exporting clean CSV or Excel.
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6 min readAI Chart Extraction vs. Calibrated Digitization: When to Use Each
A decision framework for choosing between vision LLMs, specialized ML models, color-based auto-extraction, and manual calibrated digitization. Pros, cons, and a chart-by-chart recommendation.
4 min readWorkshop: Multi-Series Line Chart with a Legend
Extract 36 data points across three product lines from a year of monthly data. Practice the per-series workflow that AI chart extraction reliably gets wrong.
6 min readWhy AI Models Get Chart Data Wrong
Vision LLMs read images as patches, gravitate to round numbers, and treat axis interpretation as a language task. Here's why that combination ruins chart extraction — and what would have to change for it to work.
3 min readWorkshop: Extract a Simple Bar Chart (5 Minutes)
A guided practice extraction of a 5-bar chart with known ground-truth values. Hands-on intro to the five-step digitization workflow, with an answer key to grade yourself.