Arduboy doesn’t support gray scale. All the attempts at gray are just flickering between black and white. It can look nice with smaller images at the right refresh rate, but there is more flickering the more gray you do.
It’s probably best to think in terms of black or white for now. Or using a checkered pattern can kind of give a gray look as well.
Is there a simple converter that has grey scale , maybe post a couple links.
I had this problem previously, but I started reading through posts and found @crait’s Make Your Own Arduboy Game tutorial series, and found this great .png to 0x00 converter, which you can find a link to here.
Yet, alas, Arduboy can not display greyscale, as it’s screen is only black and white.
But, there have been many experiments to display greyscale images using flickering of the screen to simulate grey.