Bangle.js doesn't support 4 bit RGBA - it assumes that all 4 bit images use the Mac palette. You can see what color formats are supported here: https://www.espruino.com/Reference#l_Graphics_drawImage
@NebbishHacker started
Espruino is a JavaScript interpreter for low-power Microcontrollers. This site is both a support community for Espruino and a place to share what you are working on.
Bangle.js doesn't support 4 bit RGBA - it assumes that all 4 bit images use the Mac palette. You can see what color formats are supported here: https://www.espruino.com/Reference#l_Graphics_drawImage