Convert a line thickness from pixels to degrees of visual angle

Inverse of visual_angle_to_px(). See its documentation for the default viewing conditions, the convention argument, and why the conditions should be overridden for a real setup.

Usage

px_to_visual_angle(
  px,
  viewing_distance_in = 30,
  dpi = 96,
  convention = .C4A$angle_convention
)

Arguments

px

line thickness in pixels

viewing_distance_in

viewing distance, in inches

dpi

display resolution, in dots (pixels) per inch

convention

"szafir" or "standard" – see visual_angle_to_px(). Defaults to the angle_convention package option (see c4a_options()).

Value

line thickness in degrees of visual angle

See also

visual_angle_to_px(), line_discrim_prob(), c4a_options()