chart-data-extractor

# 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 | Attribute | Value | |---|---| | Chart type | [Bar / Line / Pie / Scatter / Area / Other] | | Chart title (if visible) | [Title text] | | X-axis label | [Label + unit] | | Y-axis label | [Label + unit] | | Number of series | N | | Legend categories | [List] | | Data period (if time-based) | [Start — End] | ### 2. Extracted Data Table | [X axis] | [Series 1] | [Series 2] | ... | |---|---|---|---| | [Value] | [Value] | [Value] | | ### 3. Confidence Levels For each data point or series, flag confidence: - **High confidence:** data points where the value is clearly readable against gridlines or labels - **Medium confidence:** data points where the value is interpolated between gridlines - **Low confidence:** data points where ...