Adding pitch_alpha would allow more effects like glowing pitch lines (see https://github.com/dhaitz/mplcyberpunk). This would require changing the six yard box and penalty area to lines instead of rectangles. This is because the boxes currently overlap with the pitch sidelines and the boxes overlap and with transparency the overlap would be a darker colour.
Adding pitch_alpha would allow more effects like glowing pitch lines (see https://github.com/dhaitz/mplcyberpunk). This would require changing the six yard box and penalty area to lines instead of rectangles. This is because the boxes currently overlap with the pitch sidelines and the boxes overlap and with transparency the overlap would be a darker colour.