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HTXT_2_How does it work_
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• Scan the plot at the highest magnification possible
on your screen; i.e. make the image fit the whole
screen if possible. The screen resolution is
the limiting factor stealing the data.
• Save the image as a MacPaint or as a PICT
format file.
• Open DataThief. You will be prompted to open a
file. Select the image you would like to steal
data points from.
• The plot will appear on the screen. Now move
the mouse pointer to the leftmost point of the
horizontal axis in your plot and click the mouse.
A dialog box will show, in which you can fill in
the real X coordinate of this axis point.
• Then move the mouse pointer to the rightmost
position of the horizontal axis and click the mouse
once. You will get another dialog box; fill in the
appropriate value. Do the same for the lowest and
highest points on the vertical axis.
• You will now be prompted for an optional correction
in the axes coordinates and additional options;
e.g. error bars, logaritmic axes & markers to make
your datapoint-clicking visible.
• Don't be afraid if the plot appears skewed on the
screen. DataThief will correct for skewness in the
output file.
• This is the time to investigate the options in the
menu bar. You can click each datapoint separately
or perform an automatic scan. In the latter case
you can set several variables to make the scan fit
your wishes. Try it out and find your preferences.
• Now move the mouse pointer to the first data point
you want to steal and click the mouse once. Repeat
this for all data points or watch the scan going on.
• In single data mode, if you have selected error
bars, click on either the upper or the lower
extremity of the error bar, then click on the
remaining extremity.
DataThief is smart enough to realize which end
of the error bar has the highest value, and will
save that value accordingly.
• When you have clicked all data points, select
Save or Close from the File menu.
This will save your data points in a TEXT file
which can be read by any word processor,
spreadsheet or plotting program. If you like,
you can set the 'creator'. This enables your
favorite program for further processing to
open the data file automagically.