What’s the current approved way to get image properties within a Lua function?

very old:
local pic = figures.getinfo(figures.current().status.fullname)

used to work in 2019:
local pic = img.scan{filename = figures.current().status.fullname}

if I understand this right, "img" isn’t valid anymore:
token call, execute: grph-imagelib.lua:37: attempt to index a nil value (global 'img')

I’d like to know the pixel size and if possible also the scaled target size of an image; either the "current" one or by name.

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