I was wondering if is possible to use GDK to develop a app capable of creating vignettes on Glass, like this.
Is it possible?
Interesting question. I imagine your app would need to do 3 steps:
Steps 2 and 3 are pretty easy and shouldn't be a problem on Glass.
When it comes to step 1, you can take a screenshot from your app in Android by creating a bitmap from a view, which should work on Glass as well. But I don't think you can screenshot other apps or the timeline, so I don't think it is doable in general.