Slow Scan television (SSTV) is a picture transmission method used mainly by amateur radio operators, to transmit and receive static pictures via radio in monochrome or color.
A literal term for SSTV is narrowband television. Analog broadcast television requires at least 6 MHz wide channels, because it transmits 25 or 30 picture frames per second (in the NTSC, PAL or SECAM color systems), but SSTV usually only takes up to a maximum of 3 kHz of bandwidth. It is a much slower method of still picture transmission, usually taking from about eight seconds to a couple of minutes, depending on the mode used, to transmit one image frame.
SSTV using MMSSTV
Setting up SSTV (detailed instructions)
Download details and user manual can be located here
https://hamsoft.ca/pages/mmsstv.php
YouTube clip showing basic MMSSTV setup
https://www.youtube.com/watch?v=it8OlivRP9Q
How to set up templates and add graphics:
https://hamsoft.ca/pages/mmsstv/quick-start-graphics.php
MMSSTV Manual by VK2ACD
MixW 3.2
An alternative way to decode SSTV
http://mixw.net/index.php?j=downloads