8x9 inches isn't a video aspect ratio and hence, should be the size of the entire poster. Either you double-check with them or go with the 100% incremental scaling with the layer set to draft quality or look for a Photoshop plugin. I recall a Photoshop plugin that does up-sizing and the compnay offers a fully functional plugin during the trial period. Do a GOogle and you should be well setup for that.
Instant HD is optimized for video/film rez. Your mileage may differ. And Red Giant offers a trial, so you should be too far from discovering if it'll work for you.
HTH
RoRK
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