Sorry for the multiple messages, but I found the solution
to my problem :
after resizing an image, it seems necessary to update its
imagedata before cropping it :
put width of img 1 into w
put height of img 1 into h
put w/h into tratio
set width of img 1 to 150
set height of img 1 to 150/tratio
get the imagedata of img 1
set imagedata of img 1 to it
-- then crop works as expected
LC 9.6.9 on Mac 10.15
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