Date: Fri, 9 Aug 2002
Subject: IgorThief
From: Daniel Murphy <dan@physics.ucsb.edu>

IgorThief.ipf

IgorThief.ipf is an IgorPro procedure file that provides an easy way to extract data from a
scanned graph.  It is similar to the program DataThief for Windows and Macintosh.

IgorThief is a basic digitizer, in that you have to  click on each data point: there's no autotrace.  
It works on arbitrarily rotated graphs, and because it uses Igor one can use almost any image format.

Instructions:

1. Load procedure IgorThief.ipf and compile it.  A new menu item, IgorThief, will be added to the 
Data->Packages menu.
2. Select Data->Packages->IgorThief.  A new graph window called IgorThief will appear.
3. Click the "Load Image" button.  You'll be prompted for an image file.
4. Assuming the image loads correctly (tiff and pict files have been tested), set the x and y 
minima and maxima by
  a.  Clicking a button (e.g. Set Xmin Point) then clicking on location in image.
  A cursor will be appended to the graph at the selected location.
  b.  Entering the value for the minimum or maximum
  (e.g. if the minimum x value is zero, enter "0" for Xmin.)
5. Check "log x axis" or "log y axis" if either is a log base 10 axis.
6. Select x and y waves to receive the digitized data.  The data will be appended to 
the end of the waves.  One must select an x and y wave, or you'll get an error.