There are libraries in most languages to output sixel graphics, however libsixel (https://saitoha.github.io/libsixel/ https://saitoha.github.io/libsixel/) is a

There are libraries in most languages to output sixel graphics, however libsixel (https://saitoha.github.io/libsixel/ https://saitoha.github.io/libsixel/) is a popular one written in C. There are some interesting use-cases shown on that page. These will abstract away the escape sequences and allow you to pass them a raw bitmap.