Engauge Digitizer for Mac

From ATG:

Engauge Digitizer 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 Microsoft Excel and Gnumeric.

Features:

• Automatic grid line removal
• Automatic point matching
• Automatic curve tracing
• Compensates for image distortions, from scanners and fax machines, in graphs
• Handles cartesian, polar, linear and logarithmic graphs
• Extensive preview capability while modifying settings