Difference in output resolution when using the resolution guide

Hi! I'm really enjoying the project and thank you for all the work.

While using the resolution guide for 1080p (6.4 for -W and 3.6 for -H), I've noticed the resulting resolution is 1950x1110 instead of 1920x1080.

I think this is because of pad_inches=0.05 in here:

save_kwargs = dict(
        facecolor=THEME["bg"],
        bbox_inches="tight",
        pad_inches=0.05,
    )

At 300 dpi, this would add 30 pixels since there are additional 0.1 inches in both dimensions.

Can we change the resolution guide so that it matches the DPI setting?