Another day, another update, with a few optimizations.
The scanline debug is now more aggressive which should make it more likely to catch the signatures you need to set it up. And it no longer puts duplicate (or repeating) signatures in the file.
Small delay values should now work better than before. You might still have to experiment which values work best for you, but before something like 'delay=0.1 0.1 0.1' didn't work too well (too many pngshow instances fighting each other and in the end none managing to actually display before poweroff).
There just isn't much time between the "Poweroff" message and the device actually powering off. The mod has to display its image in that time, particularly in scanline mode this means using more (and smaller) delays.
It also means that you should not make your PNG images too large as they have to be loaded from storage and displayed as well. So make sure the resolution of the PNG is not higher than your display, and reduce color images to 16 levels of gray as the display can't do color anyway.
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