Engauge Digitizer is a powerful, open-source data extraction tool used to convert images of graphs, charts, and plots back into precise numerical data. It acts as the reverse of a graphing application by turning pixels into usable CSV or text coordinates.
Extracting plot data accurately relies on a standard workflow, from image calibration to advanced line filtering. 1. Image Import and Setup
Format support: Import common formats like PNG, JPEG, SVG, or TIFF.
Image prep: Use high-contrast images; crop out unnecessary margins beforehand.
Interactive guide: A built-in Wizard can provide a checklist to guide you from import to export. 2. Coordinate System Calibration
To map image pixels to real mathematical values, you must define the axes: Axis Selection: Select the Axis Point tool.
Define coordinates: Click three known points on the chart (usually the origin, a point on the far right of the X-axis, and a point at the top of the Y-axis).
Enter scale settings: Input the actual values for those points. Engauge supports Cartesian, polar, linear, and logarithmic graphs. 3. Image Filtering & Noise Removal
Before extracting lines, you need to isolate your data from background elements:
Engauge Digitizer Alternative to Digitize Graph & Plot Images
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