The mode specifications are taken from the Dayton Paper, JL Barber, "Proposal for SSTV Mode
Specifications", 2000:
http://www.barberdsp.com/downloads/Dayton%20Paper.pdf
Tap "Take Picture" or "Pick Picture" menu button or
use the Share option of any app like Gallery to load an image.
To keep the aspect ratio, black borders will be added if necessary.
Original image can be resend using another mode without reloading.
After image rotation or mode changing the image
will be scaled to that mode's native size.
After closing the app the loaded image will not be stored.
Single tap to add a text overlay.
Single tap on text overlay to edit it.
Long press to move text overlay.
Remove the text to remove a text overlay.
After closing the app all text overlays
will be stored and reloaded when restarting.