I have added support to my SCDTools (
http://sourceforge.net/p/scdtools/code/HEAD/tree/) to extract data from the GST file format (scdgstextract). The coolest features is that it makes composite images based on the VDP data. Here is a sample of the first level in hyperstone heist. If you examine the gif, it has 23 frames with unique frames for scroll low, scroll high, window low, window high, backdrop, and each sprite in use. My initial main goal of making the composite is to be able to see how the seperate sprites are used to make multiple sprite characters.
http://i.imgur.com/nk0u7PP.gif
Here is a looping one to show it easier:
There are still limitations on this for most windows and for any horizontal scrolling or any vertical scrolling, but I was excited to show it off
