Getting information from image graphs

Hello,

I am fairly new to using Igor Pro and am having a bit of a problem. I know that there is a way to get the raw data, or at least a rough estimate of the data, from an image of a graph. I think the function is called something along the lines of Igor Thief. IF someone could please help me out with this it would be much appreciated. I am trying to compare some of my data to that in a published paper and I need to do a bit of converting along the x-axis of the published work.

Thanks
Add #include <igorthief> to the procedure window.
After compiling you'll find the corresponding entry in the Packages submenu inside the Data menu.

A