Dithering in Bangle JS 2

The Bangle.js 2 only supports 3-bit colours, any others will be dithered. So you'll want to use an image containing only these colours:

.White { color: rgb(255, 255, 255) }
.Black { color: rgb(0, 0, 0) }
.Red { color: rgb(255, 0, 0) }
.Green { color: rgb(0, 255, 0) }
.Blue { color: rgb(0, 0, 255) }
.Cyan { color: rgb(0, 255, 255) }
.Magenta { color: rgb(255, 0, 255) }
.Yellow { color: rgb(255, 255, 0) }

I haven't tried it, but I think if you go to the image converter, and select

• Diffusion: nearest color (flat)
  
• Colours: 3 bit RGB
  
  

it might apply those and result in an image that won't be dithered.