Deleting color definitions

[Klaus Daube]

   Hello friends,

   FM 7.2 p158:

   There is no problem with PNG graphics with a pixel depth of 24 bits (16 mill
   of colours). However PNG graphics with 8bit pixel depth (256 colours) fill
   the colour catalogue with numbers of colours named RGB xxx,xxx.xxx.

   Although you can eleminate these definitions by saving as MIF (they will not
   be present in the MIF) or Klaus Müllers script Delete Unused Colours, these
   definitions are back after opening the MIF or saving the cleaned file …

   IMHO the filter not only fails for these files on import but is invoked also
   when displaying the file.

   Klaus Daube

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