Do you think you could provide a bit more information? I'm not sure I understand the problem.
If you're using a black and white image you can select 2 bit greyscale when converting it, which will mean that any antialiased corners make it into Bangle.js
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.
Do you think you could provide a bit more information? I'm not sure I understand the problem.
If you're using a black and white image you can select
2 bit greyscale
when converting it, which will mean that any antialiased corners make it into Bangle.js