🚀 go-pugleaf

...
   > Can I do this mapping? Waht data does
   > EDITIMAGE see - the 8 bit or the 16 bit? 
   Editimage gets the 16bit data but maps them according to the map. So the
   data you interactively work with is the result from the mapping process(8bit).
Unfortunately putimage seems to know about the underlying data so that
the pixel display shows real image intensities, not just the 8 bit
displayed intensities. Editimage seems to operate on only the 8 bit data. :-(

   > What happens if I use
   > the second map (which must be of type LONG or FLOAT) to store the
   > histogram? I only want 8 bits of data for the display but the "other"
   > colormap (which is actually a histogram) must be at least 4 bytes/entry.
   You cannot have two different data storage types for maps in a single
   viff file. As the Histogram is not really a map anyway, i'd suggest writing
   it into another file.

While I might end up doing this, my preference was to stay within the
VIFF I/O structure so I did not end up reading/writing a lot of custom
images.

Thanks for the very understandable comments.