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'Engauge' converts an image file showing 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. The process starts with an image file containing a graph or map; The final result is digitized data that can be used by other tools such as Gnumeric. Its features include automatic grid line removal, point matching, and curve tracing; the ability to handle cartesian, polar, linear and logarithmic graphs; image processing that highlights data by removing grid lines and backgrounds; context sensitive help; and preview windows that give immediate feedback while modifying various settings.


User manual availablw in HTML format from


Download version 2.12 (stable)
released on 24 November 2004

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LicenseVerified byVerified onNotes
GPLv2orlaterJanet Casey28 October 2004

Leaders and contributors

Mark Mitchell Maintainer

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Software prerequisites

This entry (in part or in whole) was last reviewed on 7 January 2008.


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