EMF - problems with colorscale

A user reported that the color scale doesn't render properly in an EMF file produced by Orca:
![fig emf](https://user-images.githubusercontent.com/301546/54715661-52b7d600-4b2a-11e9-9fca-68a35515b365.png)

More details about how this result was obtained will follow.