The SlideMagic presentation web app has a few neat tricks up it sleeve, one of them is automatic conversion to a dark background (and back). I managed to get that one to work as well in the new PowerPoint conversion plug in.
And I added a new one that has not yet been implemented in the web app: automatic 16:9 conversion that keeps your picture cropping in tact. The tool reads the center of the image crop, and repositions the picture correctly in the new aspect ratio.
It is interesting to see what you can do now that I have control of an entire presentation file with all its bits and pieces and can basically tell an algorithm to do with it what I want.
I hope to get the plug in ready for release soon, some further stress testing is required, plus I need to get smart on signing software / distributing license keys. Watch this space.