cimg.limit.openmp()
#A test on an image returns a pixset
boats > 250
#Pixsets can be combined using the usual Boolean operators
(boats > 230) & (Xc(boats) < width(boats)/2)
#Subset an image using a pixset
boats[boats > 250]
#Turn a pixset into an image
as.cimg(boats > 250)
#Equivalently:
(boats > 250) + 0
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