Digitize you charts with Engauge Digitizer

A few words of appreciation for an open source software that can help you a lot in your work, Engauge Digitizer (ED) from Mark Mitchell. ED is a simple, straightforward curve digitizer: it takes images with graphs like the one below and transform them (with a little help) in data you can use later on.

170804-Engauge-survival0

There are several curve digitizers you can try, some you need to pay (usually they try to recognize the curve(s) automatically), some for free and some even open source (I used Plot Digitizer before).

What I like about ED is that it greets you with a simple wizard, accompany you with a to-do list (see screenshot below) of things to do (typically first create the axes and then the various curves) and finally add points for the relevant curve.

170804-Engauge-Digitizer-screenshot

170804-Engauge-Digitizer-results

There are many options to customize your curve(s), there are some detection mechanisms that help you have the best curve possible. However, in a simple case like shown above, I usually manually add as many points as I can so I get an idea of how the data behave (especially around major inflection points in the curve). Data generated by such method will never be as good as the original data – so don’t make the process more complex than it is.

In the end, you can export the data in CSV format and use it in any software you want. Quick, simple, useful!

Engauge Digitizer is available for Linux, Windows and MacOS.

Leave a Reply

Fill in your details below or click an icon to log in:

WordPress.com Logo

You are commenting using your WordPress.com account. Log Out / Change )

Twitter picture

You are commenting using your Twitter account. Log Out / Change )

Facebook photo

You are commenting using your Facebook account. Log Out / Change )

Google+ photo

You are commenting using your Google+ account. Log Out / Change )

Connecting to %s