> Do you perhaps want to start with "65536 values from 0-255"?
Exactly (but my data doesn't have any 255 value, 254 is highest). I don't think
that's the problem because ImageMagick can convert the packed array to an image and
it looks good. I don't know much about image formats or binary data. I learned
that the array has to be packed like that by digging in this source code for Image::BMP.
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