Converting raster to PPP using as.ppp() requires maptools, which is no longer on CRAN about maptools HOT 1 OPEN

I am also running into a similar issue when trying to convert a raster to an "im" object in R 4.3.2 and spatstat 3.0-7. I'm trying to use a raster as the mu variable in rMatClust and previously the code below worked (R version 4.2.2, spatstat 3.0-2) but now I'm getting an error that X can't be converted to a pixel image. I assume this is because the previous version of "as.im" relied on maptools which is no longer available.

rMatClust(10, 10, mu = as.im(myraster)

I have found a workaround to convert the raster to a matrix, then invert and transpose it so it is correctly aligned, and then use spatstat.geom::as.im() to convert it, and I use the calls "xcol" and "yrow" in as.im() to define the extent of the window. However, this modified code produces no point outputs when using the same parameters as the original method.

I've reverted to an old version of R to get my code to run. Is there any workaround to convert raster or terra objects to pixel images?

Thank you
Julia S

from maptools.