Just FYI, I'd recommend you use https://www.espruino.com/Image+Converter rather than the one in espruinotools, but both should work ok.
Optimal 1 bpp
But for what you're actually doing, you're better with 1 bpp as @joyrider3774 says (just ensure the graphic itself is white, not black). Then, you can just use one image and g.setColor to adjust its color
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