Change/rotate colors in image while keep same palette

[GoogleCodeExporter]

I would like to have a feature to switch colors bitwise.

If I have color 1 as darkblue and color 2 as lightblue: 

I would like the bitmap image/ranged selection to be changed so that darkblue 
and lightblue is switched in the image bitmap, while the palette still has 
color 1 as darkblue and color 2 as lightblue.

Possible, it would also be nice if this could be done for all 3 colors at same 
time for koala, mc char or sprite modes. So you have a window that pops up and 
gives you the possibility to change bitwise in image "from colors to colors" 
for all 3 colors, while afterwards keep the original palette of the 3 original 
colors.

Hope it makes sense. :)

/Magnar

Original issue reported on code.google.com by [email protected] on 14 Jan 2014 at 2:26