In android webview, how do you not allow zoom out

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http://stackoverflow.com – I want to let my user zoom in on a web page my app is serving to it's web view. But I don't want them to be able to zoom out past 100%. Part of what my app presents to the user is a JPG. Users may wish to view this JPG in more detail, but I've noticed that they can also zoom out past the 100% mark. It sort of looks like it stops at 25% but that's just a guess. Question: is there a way to change the min zoom size from 25% to 100%? Note I do not want to turn off zooming, I just don't want to let them zoom out too much. (HowTos)