Engauge Digitizer is an open-source digitizing app that converts an image file which shows a graph or map into numbers. The image file can come from a scanner, digital camera, or screenshot. The numbers can be read on the screen, and written or copied to a spreadsheet.

Features

• Automatic grid-line removal
• Automatic point matching
• Automatic curve tracing
• Automatic axes matching
• Handles cartesian, polar, linear, and logarithmic graphs
• Support for drag-and-drop and copy-and-paste makes data transfer fast and easy
• Image processing highlights data by removing grid lines and backgrounds
• Context-sensitive help, user manual, and tutorials explain every feature
• Preview windows give immediate feedback while modifying settings