Original image with 70391 colors

Original image after color reduction
5 color levels
13185 CCs

Image after CCs filtering
1378 CCs

Image after inital grouping procedure
1049 CCs

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Initial grouping for CCs of color plane 1

Final grouping for CCs of color plane 1 (invalid connections removal)

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Final result with all color planes (Tp=0.75)
17 groups
177 CCs