# Get Data from Picture Curve

Usually, fan supplier provided the PQ curve of fans, but they don't provide the data point values. It will be not convenient for us to setting the fan curve on simulation program, such as Icepak or Flotherm.

Here introduce an online tool that can can help us get extract numerical data from images.

WebPlotDigitizer is a web based program to extract numerical data from plots and images.

The usage is very simple

1. File - load image to open the pictures.
2. Define the Axes by click two points on X and Y, and then it will ask you to input the X and Y value of these four points you click just now.
3. Then you can extract the values by manual module or automatic module.

It's very simple to use, just try it.

jQuery Calx https://github.com/xsanisty/jquery-calx

http://www.highcharts.com/