Bill,
 
Many thanks for the quick response.
 
When adding these two lines
 
flipreadrgb=: ]
flipwritergb=: ]
 
as you suggested, everything works perfectly.
 
The colors are swapped correctly, as far as I can say.
 
My Steganography experiments, which hide messages in bit
planes, work the same way as before.
 
Thanks again.
 
Martin
 
 
 
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