1) Is there are continuous cycle type option in the hdtv's setup menus?
2) I chose to stick with the original aspect ratio of a 27x40" poster, and fill the hdtv's pane side to side.
This will leave bars top and bottom of the hdtv's panel, as most slideshow programs center images.
The alternative is what I started doing, a poster resized to 1920 tall, and then cut image down to 1080 pixels in width.
I also occasionally oversize an image larger then 1080x1600 and use a cut and paste to a remove something undesirable in an image.
I do use GMP ( + an ancient viewing program for simple rotation of posters) but only in very simple terms. Most of what I do is simple
resizing and cut and paste then export. And after a hundred or so posters, you get a really god feel for what you can do, and your speed at converting,
gets much, much faster.
Auburn0008 does something like I do, except for a color panel, he adds a resized banner to the bottom of the 1080x1620 resolution he chose
to use. It's a similar approach to what I do, except his 1080x1620 pixel uses the other common poster aspect ratio of 27x41".
I didn't see a lot of potential for a huge amount of posters using the full hdtv panel, but it seems there is quite a bit that will work. I settled for volume,
and keeping a original aspect ratio so they do look like posters. Blu-Benny' post 211 in this thread shows off the use of a full panel in the elongated
aspect ratio, and a pretty good variety of posters......