Sorry if this has been reported before, I was too lazy looking through all the 
archives.

When using the PNG writer with e.g. bits=4 it still stores a palette with full 
256 entries into the resulting file.
This is not only a waste of space, it also makes e.g. GIMP silently convert it 
to a 8-bit palette image (and store it as such on save).

Solution: PNG writer should clip the palette as appropriate.


Keep up the good work!
-- 
Wolfgang Fellger
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