[Bug] Unexpected grayscale mapping on EV3

[laurensvalk]

The current brightness to EV3 color code mapping appears to be 33%, 33%, 33%, 1%:

• 0: 3
• 1: 3
• 25: 3
• 33: 3
• 34: 2
• 66: 2
• 67: 1
• 99: 1
• 100: 0

For four colors, I would have expected them to be evenly distributed in chunks of 25%.

To reproduce, replace 67 with an intensity of your choosing.

hub.screen.draw_box(0, 0, 100, 100, fill=True, color=Color(0, 0, 67))