Chart Data Extractor Skill

Extracts data from images of charts and graphs — bar charts, line charts, pie charts, scatter plots, and tables in images — producing a structured data table that can be used in spreadsheets or rebuilt in any charting tool. Built to leverage Opus 4.7 pixel-level image analysis capabilities.

Required Inputs

Ask the user for these if not provided:

• The chart image (upload a screenshot or image file)
• Chart type (if ambiguous — bar / line / pie / scatter / other)
• What matters most (approximate trends / precise values / specific data points / categorisation)
• Known axis values (optional — if the user knows the max/min values to anchor the extraction)

Output Structure

1. Chart Identification