I’ve been trying to build a simple gganimate and I need it to be of high quality.

When increasing the resolution I see that the chart is changing its size completely and looks different, much better.
But size increases and I don’t understand why.

   library(ggplot2)
   library(gganimate)
   
   anim <- ggplot(airquality, aes(Day, Temp)) +
     geom_point(aes(colour = factor(Month))) +
     transition_time(Day) + 
     enter_fade() +
     exit_fade()
   
   animate(anim, renderer = av_renderer('1.mp4'), 
           duration = 20,
           width = 1920, height = 1080,  fps = 25)
   
   animate(anim, renderer = av_renderer('2.mp4'), 
           duration = 20,
           width = 1920, height = 1080, res = 100, fps = 25)
   
   animate(anim, renderer = av_renderer('3.mp4'), 
           duration = 20,
           width = 1920, height = 1080, res = 300, fps = 25)

Is the an option to increase the resolution while keeping the same width and height?

And how am I supposed to pick the correct resolution depending on the size of the plot?

Thank you for the support