Unfortunately raw_datachannels doesn't follow raw_storechannels, so if you supply one, you probably need to supply the other, this
also lets you switch to pack "C*" to pack the data as bytes. I don't have your data, so I can't check this does exactly what you want.
my $img = Imager->new(
type => 'raw',
xsize => 256,
ysize => 256,
data => pack('C*', @data),
raw_interleave => 0,
raw_storechannels => 1,
raw_datachannels => 1,
model => 'gray'
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