R Under development (unstable) (2023-08-09 r84924 ucrt) -- "Unsuffered Consequences"
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> suppressPackageStartupMessages(library(sf))
> 
> library(stars)
Loading required package: abind
> if (suppressPackageStartupMessages(require(spatstat.geom, quietly = TRUE))) {
+ tif = system.file("tif/L7_ETMs.tif", package = "stars")
+ s = adrop(read_stars(tif)[,,,1]) > 70
+ plot(s)
+ m = as.owin(s)
+ plot(m)
+ print(table(m$m))
+ }

FALSE  TRUE 
39494 83354 
> 
> proc.time()
   user  system elapsed 
   1.89    0.26    2.15