Count number of mosaic tiles occurencies per color

[aquilinux]

Hello, i'm trying to easy the process of making mosaic (real mosaics) from photos with the use of GIMP.
So far i have:

- Created a custom 37 colors palette of solid colors i use with mosaic tiles
- Created a Distort/Mosaic preset with the preferred mosaic settings (i use one color oper tile)
- Imported Image -> Distort Image -> Indexed image with palette colors (see attachment)

Now that i have a mosaic, how can i count the number of tiles i need per color (based on my palette)? (ex. 30 Black tiles, 57 Green tiles)


I'm familiar with basic programming but i'm no programmer.
Can anyone give me hints on this or does already exist a script/plugin/extension for this?



Thanks!