Btw, i got an idea for a new feature (besides my request for UNIX time binary), how about adding a GUI for customizing the images?

I imagine it could be kinda like this:

* One slot for the background image and one slot for a foreground overlay

And for the LEDs (these settings would be the same for each individual LED)

* A background image

* A foreground image

* An image of the LED turned off (would go in the between the previous two

* An image of the LED turned on (positioned like the previous), to be blended using normal blending

* An image of the LED turned on (on top of everything) to be blended using additive blending

Add a tinting option (a color picker, with saturation and brightness parameters included, not just hue) for each layer and a checkbox to lock the tintings together. And if possible add an option to toggle between regular tinting (which transforms a grayscale from black to white into from black to color) and "mids tinting" (that turns a grayscale from black to white into from black to color to white), i'm not sure what is the right name for the second mode, for each layer.

Using PNG you can have gradual transparency, good for compositing; and with a few formats (including PNG) you can have a fully transparent image for any slot you don't wanna use.